三角形的正投影特性

Special Characteristic of the Orthogonal Projection of Triangle

本文根据仿射变换原理,运用代数方法建立了三角形正投影特性的基本公式,讨论了三角形正投影的一些特殊情况.

In this paper, according to the principle of the offine transformation, with the help of algebra method,the basic formulas are set up of special characteristic of the orthog-nal prajrction of triangle. The paper still discusses some special situatiom of the orthogonal projection of triangle.