已知一座拱形石桥的跨度是L=37.4米,拱高为H=7.2米,求拱桥所在圆的半径R
R=(L^2+4*H^2)/(8*H)
=(37.4^2+4*7.2^2)/(8*7.2)
=(1398.76+207.36)/57.6
=1606.12/57.6
=27.88米