已知弦长L=508.33 半径R=463 求弧长C?
弧所对的圆心角为A.
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((508.33/2)/463)
=66.59度
=66.59*PI/180
=1.16222弧度
C=A*R
=1.16222*463
=538.11