Tetrahedron is one of only five Platonic solids. This is a regular polyhedron with 4 vertices, 6 edges, and 4 faces. All faces are triangular and at every vertex meet three faces and three edges.
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Drag the mouse to rotate the tetrahedron. Use the right button to remove and put back individual faces.
(Acknowledgement: I have learned most of Java details from the implementation by Meiko Rachimow.)
Tetrahedron (tetra = 4 in Greek) is one of the five Platonic solids, the other being cube, octahedron, dodecahedron, icosahedron. Tetrahedron is a triangular pyramid. With 4 faces, 6 edges, and 4 vertices it confirms to the Euler's theorem:
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