已知半径R=3.5m,弧长C=6m,它的弦长L、圆心角A各是多少?
A=C/R=6/3.5=1.714286弧度=1.714286*180/PI=98.22度
L=2*R*SIN(A/2)
=2*3.5*SIN(98.22/2)
=5.292m