
Polyhedron: A solid bounded by plane faces or polygons, especially by more than four is known as polyhedredron. The plane faces or polygons are also called faces.
Type of Solids: A regular polyhedron has similar shaped faces. An irregular polyhedron has different shaped faces. The 5 regular polyhedra are: Cube has 6 square faces. Regular tetrahedron has 4 triangular faces. Regular octahedron has 8 triangular faces. Regular dodecahedron has 12 pentagonal faces. Regular icosahedron has 20 triangular faces.
Example: What is the shape of face in a tetrahedron?
Directions: Answer the following questions. Draw at least 5 polyhedrons on a sheet of paper. 