有沒有好辦法?

Three points A,B,C are chosen at random on a circle. The probability that there exists a point P inside an equilateral triangle A_1B_1C_1 such that PA_1=BC,PB_1=AC,PC_1=AB can be expressed in the form \frac{m} {n}, where m,n are relatively prime positive integers. Find m+n.

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2? -jinjing- 給 jinjing 發送悄悄話 (0 bytes) () 01/13/2012 postreply 10:42:09

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