5 (Platonic solids)

How many Platonic solids are there?  Only 5!

Definition from Math is Fun:

A Platonic Solid is a 3D shape where:

• each face is the same regular polygon
• the same number of polygons meet at each vertex (corner)

Example: the Cube is a Platonic Solid

each face is the same-sized square 3 squares meet at each corner

The 5 Platonic Solids

	Tetrahedron 3 triangles meet at each vertex 4 Faces 4 Vertices 6 Edges
	Cube 3 squares meet at each vertex 6 Faces 8 Vertices 12 Edges
	Octahedron 4 triangles meet at each vertex 8 Faces 6 Vertices 12 Edges
	Dodecahedron 3 pentagons meet at each vertex 12 Faces 20 Vertices 30 Edges
	Icosahedron 5 triangles meet at each vertex 20 Faces 12 Vertices 30 Edges

Images courtesy of Wikipedia

Powers of 10 Project

From Wolfram Mathworld…  Click here to make models of the 5 Platonic solids.  Print them on a piece of card, cut them out, tape the edges, and you will have your own platonic solids.