A **pyramid** is defined as a three-dimensional structure encompassing a polygon as its base. You must have heard about The Great Pyramid of Giza, which is structured in the same concept. Every corner of this structure is linked to a single apex which makes it appear as a distinct shape. The edge of each base and it’s top makes a triangle. In Maths, you will learn this geometrical shape and its properties along with the formulas for pyramidsÂ to find surface area and volumes.

## Types Of Pyramids

There are different types of pyramids that are named based on the shapes of their bases.

- Triangular Pyramid
- Square Pyramid
- Pentagonal Pyramid
- Right Pyramid
- Oblique Pyramid

### Triangular Pyramid

The base of this pyramid has the shape of a triangle; therefore, we call it as a triangular pyramid.

### Square Pyramid

The base of this type of pyramid has a shape of a square; therefore, we call it a Square Pyramid.

### Pentagonal Pyramid

The base of this pyramid has the shape of a Pentagon; therefore, we call it a Pentagonal Pyramid.

### Right Pyramid

The apex of this pyramid is exactly over the middle of the base, hence named as Right Pyramid.

### Oblique Pyramid

The apex of this pyramid is not exactly over the middle of its base and named as Oblique Pyramid.

### Regular vs Irregular Pyramid

To distinguish between regular and irregular Pyramid, you need to consider the shape of the base. If the base of a polygon is regular, it is labelled as Regular Pyramid, else it is considered as Irregular Pyramid. You can see the figures given below for both the pyramids

Â Â Â Â Â Â Â Â Â Â

**Â Â Â Â Â Â Â Â Â Â Â Â Â Â RegularÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Irregular**

## Pyramid Formulas

To find out the surface area and volumes of pyramids, some formulas can be used. The surface area of a pyramid is the total area of all the surfaces, including the base area, perimeter and slant height, such as;

**Surface Area = (base area) + (1/2) Ã— (perimeter) Ã— (slant height)**

To calculate the volume, the formula is;

**Volume = 1/ 3Â Ã— (Base Area) Ã— height**

**Note:**Â The base area is the area of the base of the pyramid, which will vary based on its types.

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