What are regular Platonic solids and their properties?

Answer 1

There are only 5 known regular Platonic solids and they and their properties are:-

1 Tetrahedron: (pyramid) 4 equilateral triangle faces, 6 edges and 4 vertices

2 Hexahedron (cube) 6 square faces, 12 edges and 8 vertices

3 Octahedron: 8 equilateral triangle faces, 12 edges and 6 vertices

4 Dodecahedron: 12 regular pentagon faces, 30 edges and 20 vertices

5 Icosahedron: 20 equilateral triangle faces, 30 edges and 12 vertices

All of them can be inscribed inside a sphere.