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Let square of size $10\times 10$ is divided into two $5\times10$ rectangles: A and B. Toss a coin with radius $1$ into the square. What's the probability that the coin is completely in A?

I have no idea about this problem. I even don't know what's the sample space. Can anyone guide me how I can go on?

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    In some problems in geometric probability, there can be quite different answers depending on one's hoice of sample space. Hard to know what is natural here. Maybe centre of square uniform on the inner $8\times 8$ square.2012-11-06

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