[問題] 一題機率
問題：
Choose two points on the unit circle randomly.
Find the probability density of the length of the chord conecting
the two points.
答案：
(4/(π^2 *(4-r^2)^(-1/2)))*(π-2sin的反函數(r/2)) , 0 < r < 2
題目是大概看得懂，不過不知道要從何下手
這題卡了有點久，煩請版上的朋友幫我解答^^
謝謝!!
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