Is it possible to tile a plane with
(a) regular 5-gons and regular 6-gons?
(B) regular 5-gons, regular 6-gons, and triangles?
(c) regular 5-gons, regular 6-gons, and regular triangles?
The only edge-to-edge regular tilings are possible with equilateral ...
The possibilities of tiling a plane with n-gons is discussed.