The 'green' reflection of a red triangle obtained by a 'blue' symmetry of each red vertex about the opposite red side [La réflexion 'verte' d'un triangle rouge obtenue par la symétrie 'bleue' de chaque sommet rouge par rapport au côté rouge opposé].
See some related bidimensionnal visualizations (possibly including this one), the blue spheres (if any) displaying the intersection points of the blue lines with the red sides:
See some related tridimensionnal visualizations (possibly including this one), the blue spheres (if any) displaying the intersection points of the blue lines with the red faces:
(CMAP28 WWW site: this page was created on 07/22/2016 and last updated on 10/05/2016
08:26:32 -CEST-)