5 (Platonic solids)
By Llisa  Published: October 5, 2011
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 samesized 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.
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