圆的半径是R=180米,弧长C=6米,求弧所对应的弦长L?
弧所对的圆心角为A.
A=C/R=6/180=0.03333弧度=0.03333*180/PI=1.91度
L=2*R*SIN(A/2)
=2*180*SIN(1.91/2)
=5.9997米
弧所对应的弦长L=5.9997米.