寻找透视三点形

á Seeking for the Perspective Three Point Shapes

研究了应用笛沙格定理时找透视三点形的三种途径:根据问题的条件或结论直接找出对应顶点;调整对应顶点;构造透视三点形。

In the paper, three methods of seeking for the perspective three point shapes when Desargue＇ s Theorem is applied has been given： discover the corresponding apex directly according to the question condition or the conclusion; adjust correspondence apex; struc- ture perspective three point shapes.