Is Microsoft Mainstreaming Machine Learning?

Tuesday Microsoft updated their open source Microsoft Cognitive Toolkit (CNTK), adding support for both C++ and Python. "This announcement is more than a point release..." argues Network World. "It's the recognition of AI and machine learning as the next big platform after mobile." This announcement represents a shift in Microsoft's customer focus from research to implementation... The toolkit is a supervised machine learning system in the same category of other open-source projects such as Tensorflow, Caffe and Torch. Microsoft is one of the leading investors in and contributors to the open machine learning software and research community. A glance at the Neural Information Processing Systems conference reveals that there are just four major technology companies committed to moving the field of neural networks forward: Microsoft, Google, Facebook and IBM. A Microsoft engineer described CNTK as "democratizing AI," according to Microsoft's announcement, which also notes that their toolkit "has been optimized to best take advantage of the NVIDIA hardware and Azure networking capabilities that are part of the Azure offering."

Read more of this story at Slashdot.

Read the full article here by Slashdot

Siège de jeu pour PC et consoles - Gris/blanc à 84.2€ @ Fk-shop.de

Salut à tous,

Ayant profité du deal sur le volant Logitech G920

https://www.deahttp://ift.tt/2eYNT3Epc-/272188

( merci Adealistrateur

)

Je me suis mis en recherche d'un support pour le fixer. Le moins cher que j'ai trouvé tourne aux alentours de 100€ juste pour le support.

J'ai regardé les playseats d'occasion sur le Boncoin ou sur le net, mais j'ai trouvé dans des prix abordables.

Avec le prix du volant, même en promo, ça commence à piquer.

Après quelques recherches et en regardant d'anciens deals je suis tombé sur ce siège baquet.

Alors j'entends déjà les raleurs qui diront c'est ce la merde, il est inconfortable, ca vaut pas un playseat etc....

Je ne chercherai pas à les convaincre. Je dirai juste que c'est le prix d'un support sans le fauteuil. Moi ça devrait m'aller, au pire, je changerai le siège si nécessaire.

Il semble réglable en hauteur et profondeur par contre le siège ne coulisse pas contrairement au modèle plus cher disponible sur le même site.

https://www.fk-http://ift.tt/2eYRJd9b6gmo0tpo3

Cependant, le modèle plus cher n'est pas réglable en hauteur ce qui est un gros défaut si l'on veut que toute la famille puisse s'amuser.

Le support pour levier de vitesse est fourni avec.

Dans l'ensemble ça devrait être pas mal pour le prix. Seul bémol, il prendra une place énorme et il faudra trouver un endroit pour le stocker. Désolé pour les Dealabsiens habitant en studio.

Il existe d'autres modèles en stocks et en promo dans des couleurs et matières différentes.

https://www.fk-http://ift.tt/2eH3Rknb6gmo0tpo3

Attention le prix obtenu se fait grâce au code de réduction newsletter2016 ( le code newsletter 2015 fonctionne aussi) et en paiement via paypal.

Des frais supplémentaires sont prévu pour un paiement via CB. ( Paypal aussi mais pour moins cher 0.98€)

Au total pour une livraison en France j'ai payé 99.10€

J'espère que ce deal vous plaira et que vous le ferez crâmer !!!!

Amitiés à tous

Read the full article here by Dealabs.com : Tous les deals HOT

ODROID XU4 Runs Cool as Water

Google's Assistant just got even smarter thanks to IFTTT

Between a chat app, two new smartphones and a new in-home avatar, Google's new Assistant is really getting around. While that slow march toward ubiquity continues, it keeps getting smarter, too -- Android Police points out you can now hook up Google Assistant to dozens of new IFTTT recipes, perfect for when you get tired of playing that emoji movies game. Just know this: you can only set up Assistant-enabled IFTTT recipes if you're using a Pixel phone or the (as yet unreleased) Google Home.

It was only a matter of time, really. Google Assistant hasn't quite reached its full potential yet, but it's already great at interpreting spoken commands. With IFTTT -- which basically acts as the connective tissue between lots of different web-facing services -- Google's Assistant just got a whole lot more useful. Just be sure not to confuse usefulness with novelty, since Amazon's suite of Echo home assistants has played nice with IFTTT for over a year now.

Anyway. There are around 57 Assistant-friendly recipes available right now, ranging from mostly mundane ("OK Google, block some time" creates an hour-long event in Google Calendar) to the surprisingly specific ("OK Google, set oven to Sabbath mode"). We've tested a few already, and can confirm that Assistant's voice recognition chops still work like a charm in these different contexts. Over the past hour, we've sent messages to Slack, added a handful of contacts to our Google accounts and added tasks to Todoist without a hitch. If only we had more smart home stuff around the office, we'd have told Google Assistant "it's party time" -- that puts Philips Hue lightbulbs in a color loop for maximum fun-times.

Via: AndroidPolice

Source: IFTTT

Read the full article here by Engadget

Qualcomm buys NXP to bolster its IoT future

Qualcomm announced it will be purchasing NXP Semiconductor, a Dutch company that acquired Freescale Semiconductor last year, in merger news that underscores the importance of IoT in the future.

According to the deal’s terms, Qualcomm will be paying $110 a share in cash for NXP, equaling a total of $47 billion.  This is a smart move for Qualcomm that will position the mobile chip leader for the large-scale IoT and automotive market.

See also: Qualcomm wants you to train your new Snapdragon

Qualcomm’s mobile presence, combined with NXP, which produces mixed-signal chips and is a major player in microcontrollers, automotive, networking and security, makes for a dynamic duo to go after Internet of things markets and smart cities.  Together, the new company expects to hit annual sales of about $35 billion.

As the market becomes saturated with smartphones and is beginning to slow, the acquisition of NXP will afford Qualcomm the opportunity to diversify from mobile.  However, forty eight percent of Qualcomm’s revenue will still come from mobile when the NXP deal closes, as compared to 61 percent as a single company. Another 29 percent of the combined company’s revenue will be from Auto and IoT.

The IoT future looking brighter for Qualcomm?

Steve Mollenkopf, Qualcomm CEO, says the joining of its technology with “NXP’s leading industry sales channels and positions in automotive, security and IoT” will let it expand its addressable market.  Self-driving transportation is a big reason for the purchase of NXP.

He goes on to explain that they plan to lead in the automotive sector, blending expertise in compute and multimedia with NXP’s leadership and the complete car infotainment system, secure car access, body and in vehicle network and safety.  There appears to be significant opportunities ahead, with the growing semiconductor content in cars expected to be larger than production of vehicles themselves.

Mollenkopf states, “I think we view the car and the Internet of things to be very similar to what I would’ve looked at for handsets in the year 2000 timeframe. Meaning the technology and the pace of innovation in automobile and IOT will increase dramatically. I think we look at it as a tremendous opportunity to extend the technology roadmap that we have in mobile in really drive those two businesses, or those opportunities going forward.”

Qualcomm anticipates about $500 million in cost savings, two years from when the deal closes.

The post Qualcomm buys NXP to bolster its IoT future appeared first on ReadWrite.

Read the full article here by ReadWriteWeb

Keep Your Gadgets Organized With This $7 Grid-It Organizer

Attempting To Use Drones To Change A Lightbulb

This is a video of Marek Baczynski and his pal Sven attempting to use two different inexpensive (~$60) quadrocopters to change a single overhead lightbulb. "How many drones does it take to screw in a lightbulb? Two. And about 9 lightbulbs. "..(Read...)

Read the full article here by Likecool

Stripe Radar – Modern Tools to Prevent Fraud

Advertise here via BSA

Stripe Radar is modern tools to prevent fraud, fully integrated with your payments. Old ways of combating fraud were never designed for modern internet businesses. Stripe Radar is powered by advanced machine learning algorithms that automatically learn from Stripe’s global network of businesses to identify and prevent fraud. Stripe Radar scans every transaction using the most relevant signals to detect and block fraud. And Radar’s algorithms are constantly tweaked by Stripe engineers to adapt to new fraud vectors.

They pinpoint fraud by building behavioral signals from across 100,000+ global companies. (Even if a card is new to your business, there’s an 80% chance it’s been seen before on the Stripe network.) Unlike systems that require weeks to train and only mimic human reviewers, Radar lets you instantly use rich payments data (including info from banks and card networks) to fight fraud.

Requirements: Stipe
Demo: http://ift.tt/2dAkJbI
License: License Free

Sponsors

Professional Web Icons for Your Websites and Applications

Read the full article here by WebAppers

Microsoft could be unveiling Teams, its Slack competitor, next week

Xiaomi's Mi MIX is all about its gorgeous edge-to-edge display

We're used to surprise announcements at Xiaomi events, but this time, it's a rather special one. After showing off the Mi Note 2, the company unveiled the Mi MIX "concept phone" -- one that's headlining with a cool 6.4-inch, edge-to-edge 1080p LCD (even at the top two round corners, and without using the old optical illusion trick). The high-end device also features a glossy full ceramic body and buttons, with no earpiece or proximity sensor, allowing for a cleaner look on the device's top edge. And, naturally, as flagship phone it has flagship specs. For a moment there, we were wondering why Xiaomi would spend so much time talking about a concept phone, but then, as a final surprise, we learned it's something people will actually be able to buy.

According to Global VP Hugo Barra, the Mi MIX was kept under wraps before launch, to the point where CEO Lei Jun didn't even use the relevant slides during rehearsal. It's no wonder, then, that were no leaks about the device. The closest I got was a rumor -- which turned out to be false -- about Xiaomi launching two versions of the Mi Note 2: one curved and one flat.

Xiaomi's collaboration with famed French designer Philippe Starck on the Mi MIX was another surprise. Barra said the project started in 2014, with Starck's main contribution being that he helped set the high-level direction for the team. Later on, he was heavily involved in guiding the device's look and feel. While sharing the stage with Lei, Starck took the opportunity to express his fondness of the ceramic edition Mi 5, which was Xiaomi's first attempt at using this fancy-looking material. By comparison, the ceramic edition Mi 5 was apparently more difficult to manufacture than the Mi MIX, due to the body's 3D curve.

Going back to the Mi MIX, you'll see that the earpiece and infrared proximity sensor have been removed from the top to make way for the edge-to-edge display. It's so expansive, in fact, that it occupies a whopping 91.3 percent of the available surface space. These features are replaced by a cantilever piezoelectric actuator behind the glass to produce both audible sound for phone calls. There's also ultrasound for proximity sensing -- a first for smartphones. The latter is powered by Elliptic Labs' cunningly-named "Inner Beauty" software solution (because it contributes to the device's outer beauty, get it?), but as simple as it sounds, this Norwegian startup has been working on this technology with Xiaomi since the end of 2014.

"Qualcomm tried to do this but they pulled out of this market," Elliptic Labs CEO Laila Danielsen told Engadget. "We know that many other smartphone manufacturers have been trying to do that, but they're not able to because it's really difficult," she added, referring to how you'd need a sophisticated algorithm to address the distortion when the signal travels through glass.

Danielsen believes that a Norwegian company like hers is more likely to succeed in this field thanks to the local expertise on ultrasound technology, which is used in the region for fishing, healthcare and seismic analysis. Now, with the launch of the Mi MIX, Elliptic Labs is apparently already 16 to 18 months ahead of the competition as it has the automatic testing tools plus scalability. Its next goal: to bring ultrasonic gesture control to smartphones as well.

The rest of the Mi MIX is just as impressive. This Android phone features a Qualcomm Snapdragon 821 chipset clocked at 2.35GHz, along with either 4GB or 6GB of LPDDR4 RAM, 128GB or 256GB of UFS 2.0 storage, a massive 4,400mAh battery with Quick Charge 3.0 support, a fingerprint reader, NFC, HD audio playback, a 16-megapixel main camera and a tiny custom-made 5-megapixel selfie camera (the module is half the size of conventional ones). Like the Mi Note 2, the Mi MIX also supports LTE Cat 11 with download speeds of up to 600Mbps using tri-carrier aggregation.

Combining these great specs with such an ambitious design, it's only fair for Barra to call this phone the "Formula One" product from Xiaomi. Still, there's no doubt that the Chinese company will also continue to serve the mainstream market -- after all, it does have some catching up to do if it wants to gain Chinese marketshare. Even so, devices like the Mi MIX feel refreshing at a time when the market for phones -- and the rate of innovation, for that matter -- is otherwise slowing.

The Mi MIX will be available in China on November 4th. The base model costs 3,499 yuan (around $516), while the top-end model -- which sports 18-karat gold rims around the main camera and fingerprint reader -- is priced at 3,999 yuan, or about $590. These cost a good deal more than what Xiaomi usually asks for, but given the unique design and specs, the price is still reasonable compared to other phones, and will probably indeed sell well in a country where Xiaomi has already won many fans.

Read the full article here by Engadget

Using Rowhammer bitflips to root Android phones is now a thing

Rust Implements An IDE Protocol From Red Hat's Collaboration With Microsoft and Codenvy

An anonymous reader quotes InfoWorld: Developers of Mozilla's Rust language, devised for fast and safe system-level programming, have unveiled the first release of the Rust Language Service, a project that provides IDEs and editors with live, contextual information about Rust code. RLS is one of the first implementations of the Language Server Protocol, co-developed by Microsoft, Codenvy, and Red Hat to standardize communications between IDEs and language runtimes. It's another sign of Rust's effort to be an A-list language across the board -- not only by providing better solutions to common programming problems, but also cultivating first-class, cutting-edge tooling support from beyond its ecosystem... The Rust Language Service is "pre-alpha", and the whole Language Service Protocol is only currently supported by two IDEs -- Eclipse and Microsoft's Visual Studio Code. Earlier InfoWorld described it as "a JSON-based data exchange protocol for providing language services consistently across different code editors and IDEs," and one of the Rust developers has already developed a sample RLS client for Visual Studio Code.

Read more of this story at Slashdot.

Read the full article here by Slashdot

Yocto driven camera design taps octa-core Snapdragon

Qualcomm and Thundercomm unveiled a Linux-supported, 4K camera reference design with an octa-core Snapdragon 625 and video analytics software.

Read the full article here by Linux Today

Free tool protects PCs from master boot record attacks

Cisco's Talos team has developed an open-source tool that can protect the master boot record of Windows computers from modification by ransomware and other malicious attacks.

Read the full article here by Linux Today

Insight: Real time gaming against Live F1 racers “only two years away”

The prospect of F1 fans being able to race in the virtual space live alongside drivers taking part in a Grand Prix is only two years away, according to Formula 1’s Chief Technical Officer. The limitation is the accuracy of the GPS positioning of the car on the race track; currently it is accurate to […]

Read the full article here by James Allen on F1 - The official website

NVIDIA VRWorks For Unreal Engine 4.13 Now Available For Free On GitHub

You can download NVIDIA VRWorks For Unreal Engine 4.13 on GitHub for free. As stated in the past, you'll need a free Unreal Engine Github account to access the UE4 GameWorks integrations. NVIDIA has made it easier than ever for game developers to add leading-edge Virtual Reality technology to their Unreal Engine 4 (UE4) games by providing custom UE4 branches for NVIDIA VRWorks technologies on GitHub. VRWorks is a comprehensive suite of APIs, libraries, and engines that enable application and headset developers to create amazing virtual reality experiences. Access UE4 GameWorks Integration: In order to access the UE4 GameWorks integrations, you will need a UE4 / GitHub subscription. Multi-Res Shading UE4.11 Multi-Res Shading UE4.12 Full VRWorks Graphics UE4.12 (Includes Multi-Res shading, VR SLI, Single Pass Stereo and Lens Matched Shading) Multi-Res Shading UE4.13 Full VRWorks Graphics UE4.13 (Includes Multi-Res shading, VR SLI, Single Pass Stereo and Lens Matched Shading) Comments

Read the full article here by [H]ardOCP News/Article Feed

Teamwork

Read the full article here by RobBomb.com

Four short links: 21 October 2016

Democratic Exfiltration, Pornish Tasties, Private Deep Learning, and Security Economics

1. Every CRS Report -- Until today, CRS reports were generally available only to the well-connected. Now, in partnership with a Republican and Democratic member of Congress, we are making these reports available to everyone for free online. The reports are only released to Congress members, and (although "public") not released to the public. There have been years of wrangling about whether to release them, so someone set up automatic exfiltration with the help of members of Congress. And they're scrubbed before release, so the office workers who compiled the reports are not identified (which would have made them targets for online hate). Democracy treats censorship as damage and routes around it.
2. Image Synthesis from Yahoo's open_nsfw Collection -- brilliant! Using Deep Dream type amplification, and Yahoo's open source porn recognizer, you can now "pornicate" everything from landscapes to a blank page. Coming soon to a camera app near you, if you'll pardon the phrase.
3. Semi-supervised Knowledge Transfer for Deep Learning from Private Training Data -- aka, how to prevent your sensitive training data from leaking out of your model. [W]e demonstrate a generally applicable approach to providing strong privacy guarantees for training data.
4. Open Course in Security Economics (edX TUDelft) -- an introduction to the field of cybersecurity through the lens of economic principles. Delivered by four leading research teams, it will provide you with the economic concepts, measurement approaches, and data analytics to make better security and IT decisions, as well as understand the forces that shape the security decisions of other actors in the ecosystem of information goods and services.

Continue reading Four short links: 21 October 2016.

Read the full article here by Four Short Links - O'Reilly Media

Photo

Read the full article here by http://owlturd.com/

Guide: How to Make Normal Maps

Environment artist Leonardo Iezzi shared a list of recommendations, which will help you to make better textures.

I’ve been spending a lot of time testing how to bake normal maps from high poly meshes. I think, a lot of 3d other involved in the game industry share this passion/chore. I got to a point where I’m pretty much confident with it. But, today, as the industry is growing, beginners usually starts directly to learn super powerful software, not taking care about what the basic. And basics are important.

So I made this little tut/diagram, in order to help people to achieve even better results and make the video game industry a better place to work. Big thanks goes to all my colleagues, because it’s also thanks to them that you know what you know.

Now you know how to bake a normal map! So do it properly from now on.

Leonardo Iezzi

Environment artist

---

© kikundra for 80lvl, 2016. | Permalink | No comment | Add to del.icio.us
Post tags:

Feed enhanced by Better Feed from Ozh

Read the full article here by 80lvl

Kodak revives its Ektra brand with a camera-centric smartphone

Kodak is a brand with history, but little relevance in the modern photographic world. The company battled through bankruptcy in 2013, refusing to give up as its film business was superseded by digital. Now, it's experimenting with smartphones. Following the IM5, a largely forgettable device aimed at shutterbugs, Kodak is trying again with the Ektra. Named after its 1941 rangefinder (and the '70s 110 film camera range) the handset certainly looks like a camera. The back is wrapped in a dark, artificial "leatherette," with a slightly curved grip on one side and a dedicated shutter button on top. A large, protruding lens pokes out the back, a 21-megapixel Sony sensor buried underneath.

Kodak hopes the camera will appeal to enthusiast photographers. The people who own a chunky DSLR, or maybe a high-end compact, and think carefully about the composition of their shots. The problem is that many smartphones already offer capable cameras. Kodak has recruited Bullitt, a phone manufacturer for hire (its clientele includes Cat, JCB and the Ministry of Sound) to make the device more photographer-friendly. The camera app, for instance, has a digital "Scene Selection Dial" that lets you access different shooting modes. Manual, Landscape, Sports, Macro -- these should be familiar to anyone who still loves the Kodak brand.

Bullitt has made Snapseed the default photo-editing app, believing it's one of the best options on the Play Store. There will also be a widget, located on one of the secondary home screens, with Kodak-curated app recommendations such as Adobe Lightroom, VSCO and Prisma. You could download these on your own, of course, and many photographers will be familiar with their features. For older customers, however -- people who remember and possibly own a Kodak camera -- it could be a useful discovery feature. In addition, Kodak is pre-loading a new Prints app which, as its name suggests, lets you order physical prints and books.

Underneath the Ektra's leather exterior is a blend of mid-range and high-end components. The phone is powered by a deca-core MediaTek Helio X20 processor and 3GB of RAM. It comes with 32GB of internal storage, which you can supplement with a MicroSD card up to 128GB, and a 3000mAh battery that supports "Pump Express" quick charging. Up top you'll be poking at a 5-inch, 1080p display and a mostly stock version of Android, save for the aforementioned Kodak apps. You'll get 6.0 Marshmallow out of the box -- no word on 7.0 Nougat, although Bullitt has promised to keep up with Google's regular security updates.

Kodak's second smartphone will launch in Europe for £449/€499 this December. The company has "no plans" to release the device in the US, although a spokesperson said it will be monitoring market demand and "reacting accordingly." It's a niche proposition, one that appeals to your personal and emotional attachment to the brand, rather than a lust for high-end specs. In all likelihood, it won't be the best smartphone camera -- some shots I took in a gloomy hotel seemed fine, but unremarkable. For the people that remember the original Ektra, however, or receiving a yellow envelope in the mail, that dip in performance might not matter.

Read the full article here by Engadget

A temporary tattoo that brings hospital care to the home | Todd Coleman

What if doctors could monitor patients at home with the same degree of accuracy they'd get during a stay at the hospital? Bioelectronics innovator Todd Coleman shares his quest to develop wearable, flexible electronic health monitoring patches that promise to revolutionize healthcare and make medicine less invasive.

Read the full article here by TEDTalks (video)

Indie Driving Survival Game from Prague

Time Rodent (the title is not final) is based on the short film of the same name and is based around vehicles. There’s not much info about the story or the backgorund, but the general premise is pretty interesting. You’re in the world, which was ruined by some unknown event.

Very simply put, it’s about driving from A to B while avoiding getting killed and learning what happened to the game’s world and where all of it’s inhabitants went. Generally speaking, as of today, there is no master plan graved in stone. I’m quite new to game development and find the non-linearity to be very exciting (and still unexplored territory). I really enjoy creating universes which unfold during the creation process, sometimes leading to completely unforeseen directions.

Ondrej Svadlena

ondrejsvadlena.com

Animator/Game Developer

Nothing is really clear so far. However, this game stands out for different reasons.

It has an amazing AI. The developer aims to deliver a believable, human-like behavior of the NPC drivers. Ondrej really feels that poor AI in open world games ruins the immersion and breaks your experience. He doesn’t want some dumb driving with cheating. Instead, he’s aiming to do something very fun.

 

The visual style is realistic and surreal at the same time. The physics is real. The world is not.

It has taken a considerable amount of development time to come up with a system which allows the NPC cars to drive in a way that is fully natural, with no “cheat” abilities, while still being good enough to keep up with a player.

The game has very interesting style. It’s sort of very realistic. With nice lighting, understandable, readable assets, but there are also elements of surreal, that blend seamlessly into the world. This creates a unique quirky atmosphere. It feels sort of like a dream. The game has dynamic lighting, weather effects, deformable terrain. The size of the world is roughly 4x60km.

The game is still a work in progress. There’s a lot of things to do, but it definitely has a lot of potential. Looking forward to hearing more about it.

---

© kikundra for 80lvl, 2016. | Permalink | No comment | Add to del.icio.us
Post tags: 3dart, driving, driving AI, driving simulation, gamedev, indiedev, Ondrej Svadlena

Feed enhanced by Better Feed from Ozh

Read the full article here by 80lvl

Homer Simpson Gives Jimmy Kimmel a Tour of Springfield

To celebrate tonight's 600th episode of Matt Groening's beloved animated sitcom, The Simpsons, Homer Simpson gives Jimmy Kimmel a private tour of Springfield...(Read...)

Read the full article here by Likecool

Red Hat Makes Ansible Galaxy Open Source

DevOps just got a little easier for some, now that Red Hat has open sourced Ansible Galaxy

Read the full article here by Linux Today

Can You Solve This Geometry Problem For Singapore Students? Finding The Area Of A Claw. Sunday Puzzle

This geometry problem was asked to students in Singapore. What is the area of the shaded region? The figure is composed of squares with side length 4 and quarter circles.

Watch the video for a solution.

Can You Solve This Geometry Problem From Singapore? The Area Of A Claw

Or keep reading.

.
.
.
.
M
I
N
D
.
Y
O
U
R
.
D
E
C
I
S
I
O
N
S
.
P
U
Z
Z
L
E
.
.
.
Answer To Geometry Problem From Singapore

I first approached the problem by considering the area of a quarter circle and then subtracting out shapes in order to find the area of the shaded region.

The answer is 32π – 64.

But there is a much more elegant solution! The key is considering the diagonal of the 3×3 grid. The upper region can be rotated about the center to join with the lower region. The resulting shape is a segment of a quarter circle that has a segment of a smaller quarter circle removed.

The area of a segment of a quarter circle is the area of a quarter circle minus the area of an isosceles right triangle. If the radius r, the area is πr²/4 – r²/2.

The larger circular segment has radius 12, and the smaller one has radius 4. So we can calculate the area:

We get to the answer 32π – 64 in a much more direct manner.

Sources

PLSE style circle problem (Mindscope Khoo channel)
https://www.youtube.com/watch?v=yb_JUZFKi-A

Challenging area question – 4 quarter circles and square
http://studyroom.sg/12/

Read the full article here by Mind Your Decisions