# Tetrahedron

*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.

Drag the mouse to rotate the tetrahedron. Use the right button to remove and put back individual faces.

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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