答案：半径是0.955米知道弦长L和拱高H的求半径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)R=0.17/2+1.09^2/(8*0.17)=0.085+0.87=0.955米
