# Regular Tetrahedron

A regular tetrahedron is a regular polyhedron composed of 4 equally sized equilateral triangles.

The regular tetrahedron is a regular triangular pyramid.

### Unfold of a Regular Tetrahedron

### Characteristics of the Tetrahedron

**Number of faces: 4**.

**Number of vertices: 4.**

**Number of edges: 6**.

**Number of concurrent edges at a vertex: 3**.

### Surface Area of a Regular Tetrahedron

### Volume of a Regular Tetrahedron

#### Example

Calculate the suface area and volume of a regular tetrahedron with an edge of 5 cm.