已知直径为D=3867,扇形弧长两点直线距离为L=3600,求弧长C?弧半径为R,弧所对的圆心角为A.R=D/2=3867/2=1933.5A=2*ARC SIN((L/2)/R)=2*ARC SIN((3600/2)/1933.5)=137.168度=137.168*PI/180=2.394035弧度C=R*A=1933.5*2...