已知扇形半径为R=600cm,弦长为L=52.3cm,如何计算弧长C?
弧所对的圆心角为A.
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((52.3/2)/600)
=4.996度
=4.996*PI/180
=0.087194弧度
C=R*A=600*0.087194=52.317cm