# Math Formulas, Practice, Tests, Forums, Free Help

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Inside a circle E with radius 2 units , there are 2 circles A and B
both with radius 1 unit . A touches E at a point and keep fixed ,
while B rolls randomly along the circumference of E .
Find the expectation of the overlapping area of A and B .

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The website was created in September 2005.

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In 2011 was created a Russian version, and in 2015 Serbian.

It is visited by 14,000 - 28,000 people daily, mostly from USA, Bulgaria, Russia, India, Philippines, Ukraine, Serbia...

In 2011 was created a Russian version, and in 2015 Serbian.

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