拱形公式
圆*** 2011-06-14 18:50:02 举报
跨度b=10米,起高h=1.6米 →半径r = [(b/2)^2+h^2]/(2h) = (25+2.56)/3.2 = 8.6125 →圆心角α=2 * arcsin(b/2r) = 70.9786865° →弧长s = πrα/180 = 10.6692665米