圆半径R=405,弧长是C=584,请问弦长L怎么计算?
弧所对的圆心角为A.
A=C/R
=584/405
=1.441975弧度
=1.441975*180/PI
=82.619度
L=2*R*SIN(A/2)
=2*405*SIN(82.619/2)
=534.7