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The circle shown has center R. If arc UST has length 48π, what is the radius of the circle?
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弧长公式：弧长=（对应圆心角*π*r）/180°
题目中给出了一个直角，弧UST对应的圆心角就是360-90=270°
48π=（270°*π*r）/180°r=32
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方法：UST是3/4个圆的周长，整个圆的周长是48π/3/4=64π=πd，d=64，r=32
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2022-07-07 21:57:33
Kath1230
公式记得 弧长=πr*圆周角 / 180
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2019-01-29 17:35:32
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