计算旋转曲面面积的定积分公式

Integration Formula for Calculating the Area of the Curved Surface of Revolution

就平面曲线绕该平面上任意直线旋转一周而成的旋转曲面 ,应用微元法 ,得到了此类曲面面积的定积分公式 .

With the method of infinitesimal element,We hare worked out an integrating formular which can be used to calculate the area of the curved surface of revolution generated from a circular motion of a line on a planar currilinear.