## CBSE Class 9 Maths Chapter 13 Surface Areas and Volumes Revision Notes

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## What is Surface area?

The surface area of a solid object is a measure of the total area that the surface of the object occupies.

## What is Volume?

Volume is the quantity of three-dimensional space enclosed by a closed surface.

### Different Types of 3-D figures

**Cuboid:**

Cuboid is a solid bounded by six faces that are rectangular in shape, having 6 faces, 8 vertices, and 12 edges.

- Lateral Surface area: 2h(l + b)
- Total Surface area: 2(lb + bh + lh)
- Volume: lbh

**Cube:**

Cuboid whose length, breadth and height are equal is called a cube.

- Lateral Surface area: 4a
^{2} - Total Surface area: 6a
^{3} - Volume: a
^{3}

### CBSE Class 9 Maths Chapter 13 Surface Areas and Volumes Revision Notes PDF