# Concept of Pyramid

#### definition

• Pyramid: A pyramid is a space figure that has a polygon as its base and triangles as all its other faces. All the faces of a pyramid, except its base, intersect at a common point.

# Pyramid:

A pyramid is a space figure that has a polygon as its base and triangles as all its other faces. All the faces of a pyramid, except its base, intersect at a common point.

## Properties of a pyramid:

• The faces of a pyramid that are not its base are called lateral faces. The number of lateral faces in a pyramid is the same as the number of sides in its polygonal base.

• The line segments created by two intersecting faces are called edges. The vertices are points where three or more edges meet.

• The vertex opposite the base is called its apex. The apex is often thought of as the "top" of the pyramid. It is also the common point shared by all the lateral faces of the pyramid.

• If the base of a pyramid is a regular polygon, it is a regular pyramid. Otherwise, it is an irregular pyramid.

### Irregular pyramid

The base of the square pyramid is a square, which is a regular polygon.

The base of the trapezoidal pyramid is a trapezoid, which is an irregular polygon.

## 2. Types of Pyramid:

### 1. Triangular Pyramid:

A triangular pyramid has a triangle as its base. It is also known as a tetrahedron. It has 4 faces (3 side faces and a base face), 4 vertices (points), and 6 edges.

### 2. Square Pyramid:

A square pyramid has a square as its base. So, a square pyramid is a pyramid with a square base, four triangular sides, five vertices, and eight edges. The base of this pyramid is a square, and the top point is the apex.

### 3. Pentagonal Pyramid:

A pentagonal pyramid is a pyramid having a pentagonal base. A pentagonal pyramid is a pyramid with a pentagonal base upon which are erected five triangular faces that meet at a point (the vertex).

### 4. Rectangular Pyramid:

A rectangular pyramid is a simple geometric figure that consists of a rectangular base and four triangle-shaped faces.

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Pyramid and Its Types [00:01:43]
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