# Regular Octahedron

A regular octahedron is a regular polyhedron composed of 8 equal equilateral triangles.

The regular octahedron can be considered to be formed by the union of two equally sized regular quadrangular pyramids at their bases.

### Unfold of a Regular Octahedron

### Characteristics of a Octahedron

**Number of faces: 8**.

**Number of vertices: 6.**

**Number of edges: 12**.

**Number of concurrent edges at a vertex: 4**.

### Surface Area of a Regular Octahedron

### Volume of a Regular Octahedron

#### Example

Calculate the surface area and volume of an octahedron with an edge of 5 cm.

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