http://wenku.baidu.com/view/f98ab9daa58da0116c1749a0.html
round top, going down the downward slope, 向心力,向downward力
l=a*r a是圆心角的弧度数,r>0
回答者: 我会做到 - 一级 2005-11-4 15:11
圆弧长度=圆心角度数*圆周长/180度
http://wenku.baidu.com/view/f98ab9daa58da0116c1749a0.html
round top, going down the downward slope, 向心力,向downward力
l=a*r a是圆心角的弧度数,r>0
回答者: 我会做到 - 一级 2005-11-4 15:11
圆弧长度=圆心角度数*圆周长/180度
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