圆的半径9米,弦长17.4米,弦高6.5米,请问弧长是多少?
问题描述:
圆的半径9米,弦长17.4米,弦高6.5米,请问弧长是多少?
答
弦长L=17.4米,弦高H=6.5米,请问弧长C是多少?弧所对的圆心角为AR=H/2+L^2/(8*H) =6.5/2+17.4^2/(8*6.5) =9.07米A=2*ARC SIN((L/2)/R) =2*ARC SIN((17.4/2)/9.07) =147.06度 =147.06*PI/180 =2.5666弧度C=A*R =2.5666*...