一半径R=500米,弦长L=50米的弧长C是多少?该弧长对应的圆心角A多少度?A=2*ARC SIN(L/(2*R)) =2*ARC SIN(50/(2*500)) =2*ARC SIN(0.05) =5.732度 =5.732*PI/180 =0.1004弧度C=A*R=0.1*500=50.02米弧长C是50.02米,该弧...