A spherical triangle with angles of 45°, 60° and 90°, 48 of these triangles tessellate ...
A spherical triangle with angles of 45°, 60° and 90°, 48 of these triangles tessellate ...
Two spherical triangles with angles of 45°, 60° and 90°; 24 of these couples of triangl...
A spherical triangle with angles of 36°, 60° and 90°, 120 of these triangles tessellate...
A spherical triangle with angles of 36°, 60° and 90°, 120 of these triangles tessellate...
Two spherical triangles with angles of 30°, 60° and 90°; 60 of these couples of triangl...
A spherical triangle with three angles of 90°, 8 of these triangles tessellate the whole ...
A spherical triangle with angles of 60°, 60°, 90°, 24 of these triangles tessellate th...
A regular tetrahedron with the tracks of its planes of symmetry and the same tracks on a s...
The three possible ways of dividing a sphere in equal spherical triangles so that every tr...
