Desargues' Triangle Theorem

If two triangles are central couple then they are axial couple and conversely

If two triangles are perspective from a point then they are perspective from a line and conversely

If two triangles are so situated that line joining the pair of corresponding vertices are concurrent then the points of intersection of pair of corresponding sides are collinear and conversely

Видео Desargues' Triangle Theorem канала Bedprasad Dhakal