Edward Brisse, Perspective Poristic Triangles.

Forum Geometricorum, 1 (2001) 9 -- 16.

Abstract:   This paper answers a question of Yiu: given a triangle ABC, to construct and enumerate the triangles which share the same circumcircle and incircle and are perspective with ABC. We show that there are exactly three such triangles, each easily constructible using ruler and compass.

[ps file] [pdf file]

Viewing and Download Instructions

Return to Forum Geometricorum, volume 1.