题库搜索>问题求解PS-13468
The points R, T, and U lie on a circle that has radius 4. If the length of arc RTU is 
, what is the length of line segment RU?
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R T U是半径为4的圆上面的点，如果RTU的弧长是4派/3.RU是多长？
圆的周长为：2派r=8派
根据弧长公式：弧长是4派/3，圆心角为a
公式：4派/3=aπR/180
4/3π=aπR/180
a=60度
所以弧所对应的角是60度
所以RU=半径=4
默默
先根据弧长公式求圆心角，在根据角的性质求边
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2018-05-07 11:44:21
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