已知弦长L=1.2米 弧高H=0.16米 求;弧的长度C 弧的度数A?弧半径为R.R^2=(R-H)^2+(L/2)^2R^2=R^2-2*R*H+H^2+L^2/42*R*H=H^2+L^2/4R=H/2+L^2/(8*H)=0.16/2+1.2^2/(8*0.16)=1.205米A=2*ARC SIN((L/2)/R)=2*ARC SIN((1.2/...