Regular Polyhedra
Polyhedra
 

Tetrahedron 2-Compound  (stella octangula). The dual of the tetrahedron is another tetrahedron.

 

Check the relation between a tetrahedron and its dual tetrahedron.

Click on the down triangles to change the size of the tetrahedron. When it reaches a certain value, a number appears in the window.

Notice the vertices, the centres of the faces and the edges.

- What singularity occurs when the number 1 appears?

- What singularity occurs when the number 2 appears?

- What singularity occurs when the number 3 appears?
       
           
  Eduardo Barbero Corral
 
Spanish Ministry of Education , Social Afairs and Sport. Year 2007
 
 

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