Who doesn't love a challenge? The best challenges, however, are actually challenging, and this problem is a perfect example. The answer is by no means obvious, so take your time and think geometrically.

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Hint: The following answers are incorrect:

We don't condone cheating, but we do empathize with frustrated minds. So, if this problem keeps you up at night, you could post a contest to ask our freelancers to figure it out for you. They are a very clever bunch.

May the mental flexing begin!

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