SECTION PROPERTIES (Area, Centroid, ...)

This app. determine the properties of polygonal

sections. The (x,y) coordinates of the vertices

of the polygon (which must be located entirely

within the first quadrant) are input sequentially

for a complete clockwise path around the

polygon. Holes in the cross section, which

do not intersect the boundary, may be deleted

by following a counter-clockwise path.

这个程序。确定多边形的属性

部分。顶点的（x，y）坐标

多边形（必须完全位于

在第一象限内）按顺序输入

围绕

多边形。横截面中的孔

不与边界相交，可以删除

遵循逆时针路径。