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If points A and B are randomly placed on the circumference of a circle with radius 2, what is the probability that the length of chord AB is greater than 2?
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当前版本由 Helen 更新于2019-01-04 16:25:03 感谢由 Helen 对此题目的解答所做出的贡献。
当AB=2时，其所对的圆心角是60°，说明AB所对的圆心角大于60°时，弦长AB>2，概率就是P=(180°-60°)/180°=2/3
当前版本由 笑笑笑笑笑 更新于2018-03-04 11:31:19 感谢由 笑笑笑笑笑 对此题目的解答所做出的贡献。
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