题库搜索>问题求解PS-13070
The points R, T, and U lie on a circle that has radius 4. If the length of arc RTU is 4Π3 , what is the length of line segment RU ?
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弧长是L，圆心角为N(n为1°的倍数）
公式：L=NπR/180
4/3π=NπR/180
N=60°
然后你会发现圆心到点R的距离和圆心到点U的距离是相同的，而且所夹角为60°，可得出ROU是正三角形（O为圆心）
既RU等于半径=4
默默
pai 在这里可以约掉
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2018-05-05 04:49:08
默默回复默默
夹角为60度的等腰三角形是等边三角形
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2018-05-05 04:50:25
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