# Regular Dodecahedron

A regular dodecahedron is a regular polyhedron composed of 12 equally sized regular pentagons.

### Unfold of a Regular Dodecahedron

### Characteristics of a Dodecahedron

**Number of faces: 12**.

**Number of vertices: 20.**

**Number of edges: 30**.

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

### Surface Area of a Regular Dodecahedron

### Volume of a Regular Dodecahedron

#### Example

Calculate the surface area and volume of a regular dodecahedron with an edge of 10 cm, knowing that the apothem of one side measures 6.88 cm.