# What Is A Prism

By the end of this lesson, you will be able to

- define prism.
- interpret the surface area of prism.
- derive the formula for the volume of prism.

## Prism

A prism is a polyhedron whose base and top are two congruent parallel polygons and other faces are parallelogram. A prism is a polyhedron with two congruent polygonal bases.

A prism showing its base, faces and edges.

## Types of Prism

There are several type of prism like

- regular prism
- irregular prism
- right prism
- oblique prism

### Regular Prism

A regular prism is a prism in which the base is a regular polygon. The regular prisms are mostly used in our daily life.

### Irregular Prism

A prism is said to be irregular if the base is a irregular polygon.

An irregular prism showing its faces and edges.

### Regular Prism Example

### Right Prism

A prism is said to be right prism if the lateral faces and their joining edges are perpendicular to the base faces. Therefore, the lateral faces are rectagles for a right prism.

### Oblique Prism

An oblique prism is a prism in which the lateral faces and joining edges are not perpendicular to the base faces. Therefore, the lateral faces are parallelograms for an oblique prism.

A right prism showing its faces and edges.