已知一条弧长为8派,它所对的圆周角为120度,求这条弧所对的弦长．
人气：433 ℃ 时间：2020-05-29 01:03:41
解答
不知算得对不对
答案为六根号三
∵圆周角是120°
∴圆心角为240°
又∵弧长为8π,
∴得240πR／180=8π
R=6
∵30°角
有勾股定理得：弧长的一半为三根号三
∴弧长是六根号三﹙没图很难说明﹚
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