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A regular tetrahedron is composed of 4 equilateral triangles. 

Each vertices of a Tetrahedron is composed three triangle edges. 

A Tetrahedron has a total of 6 edges.

A regular tetrahedron is a platonic solid.

The formula for surface area of a Tetrahedron is,
a = square root of 3 times a squared

Regular Tetrahedron Definition

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Platonic Solids

Math Video Definitions

The formula for volume of a Tetrahedron is, 
volume = square root 2/12 times a^3