Regular Polyhedra Polyhedra

 Regular Polyhedra. Regular polyhedra satisfy these conditions: - The faces of regular polyhedra are equal regular polygons. - The same number of faces with the same shape converge in all the vertices, that is, they form equal polyhedral angles. - The dihedral angles that form two border faces are equal. There are only five regular polyhedra: - The tetrahedron. - The octahedron. - The icosahedron. - The hexahedron or cube. - The dodecahedron.

The tetrahedron.

The most simple regular polyhedron is the tetrahedron.

 You can rotate the figure by moving the red dot.

- What types of polygons are its faces?

- How many faces converge in each vertex?

- Does the same number of faces with the same shape converge in each vertex?

- Are all its faces equal?

-How many faces does this polyhedron have?

-How many edges does it have?

-How many vertices does it have?

Type each answer in the corresponding box and hit Enter.

 Eduardo Barbero Corral Spanish Ministry of Education , Social Afairs and Sport. Year 2007