半径R=10.515,弦长L=4.6265.怎么算弧长C啊?
弧所对的圆心角为A.
A=2*ARC SON((L/2)/R)
=2*ARC SON((4.6265/2)/10.515)
=25.418度
=25.418*PI/180
=0.443619弧度
C=R*A=10.515*0.443619=4.6647