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数学
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若1弧度的圆心角所对的弦长等于2,则这个圆心角所对的弧长等于?
A.sin1/2 B.π/6 C.1/(sin1/2) D.2sin1/2
人气:278 ℃ 时间:2020-01-25 13:24:33
解答
求R:sin(1/2)=AB/2R=1/R,则R=1/sin(1/2),又L=R*1=R=1/sin(1/2),所以选C
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