**Definition of Pyramid**

- A pyramid is a polyhedron with a polygonal base and triangles for sides.

**Examples of Pyramid**

- A pyramid is named for the shape of its base.

Some of the polygonal pyramids are shown below.

**Solved Example on Pyramid**

How many triangular faces are there in a rectangular pyramid?

Choices:

A. 8

B. 5

C. 4

D. 9

Correct Answer: C

Solution:

Step 1:The base decides the shape of the Pyramid.

Step 2:The base of the Pyramid is a rectangle.

Step 3:There are 4 base edges in the Pyramid.

Step 4:The faces of the Pyramid joining the base edge to the vertex are the triangular faces of the Pyramid.

Step 5:So, the number of triangular faces is equal to the number of base edges of the Pyramid.

Step 6:So, there are 4 triangular faces in a rectangular Pyramid.

**Related Terms for Pyramid**

- Polyhedron
- Polygon
- Base