Physics

# Types of Prism with definitions and shapes

A **prism** is a polyhedron whose surface is formed by **two equal** and **parallel ****faces** called **bases** and by lateral faces that are called parallelograms. All the **sections** of the prism parallel to the bases are **equal**. Different types of prism are provided below.

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## Prism Elements

In a **prism** the following **elements** can be distinguished :

**Bases**(*B*): Each prism has two bases, both of which are equal and parallel.**Faces**(*C*): the parallelograms of the sides and bases.**Height**(*h*): distance between the two bases of the prism. In the case of the right prism, the length of the height h and that of the edges of the lateral faces coincide.**Vertices**(*V*): points where the faces of the prism meet.**Diagonals***(D)*: segments that join two vertices that belong to different faces.

## Types of Prism

The **prisms** can be classified according to **four criteria** :

### Number of sides of the base

Types of prism on the bases of the **number of sides** that have their **basis** :

**Triangular prism**: the bases are triangles (3 sides).**Quadrangular prism**: the bases are quadrilateral (4 sides).**Pentagonal prism**: the bases are pentagons (5 sides).**Hexagonal prism**: the bases are hexagons (6 sides).

### Regular or irregular

**Regular**prism: a prism is regular if its bases are regular polygons.**Irregular Prism**: Prisms are irregular if they have irregular polygons at their base.

### Straight or oblique

**Right prism**: if the axes of the polygons of the bases are perpendicular to the bases. The side faces are squares or rectangles.**Oblique prism**: it is one whose axes of the polygons of the bases are joined by an oblique line to the bases themselves.

### Convex or concave

**Convex**prism: the prism is convex if its bases are convex polygons.**Concave**prism: the concave prism has two equal concave polygons as bases.

**See Also**: Prisms Vs Pyramid