已知半径R=5 弦长L=9.4 求弧长C?
弧所对的圆心角为A.
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((9.4/2)/5)
=140.1度
=140.1*PI/180
=2.445261弧度
C=R*A=5*2.445261=12.226
已知半径R=10 弦长L=11.3 求弧长C?
弧所对的圆心角为A.
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((11.3/2)/10)
=68.8度
=68.8*PI/180
=1.200867弧度
C=R*A=10*1.200867=12.009