已知弦长L=8.56,拱高H=1.76米,求半径R?
R^2=(R-H)^2+(L/2)^2
R^2=R^2-2*R*H+H^2+L^2/4
2*R*H=H^2+L^2/4
R=H/2+L^2/(8*H)
=1.76/2+8.56^2/(8*1.76)
=6.0841米