## Class 9 Maths Revision Notes for Surface Areas and Volumes of Chapter 11 - Free PDF Download

Surface Areas and Volumes Class 9 Notes CBSE Maths Chapter 11 (Free PDF Download)

## FAQs on Surface Areas and Volumes Class 9 Notes CBSE Maths Chapter 11 (Free PDF Download)

1. What is surface area and volume Class 9?

Surface area is the total area of all the faces of a solid object, while volume is the amount of space that a solid object occupies.

2. What is the formula for surface area and volume?

Surface area:

Cube: 6a²

Cuboid: 2(lb + bh + lh)

Cylinder: 2πrh + 2πr²

Cone: πr(r + l)

Sphere: 4πr²

Volume:

Cube: a³

Cuboid: lbh

Cylinder: πr²h

Cone: ⅓πr²h

Sphere: 4/3πr³

Note that these are just the basic formulas for surface area and volume. There are more complex formulas for other shapes and solids.

3. What is the formula of area?

Rectangle: Area = length × width

Square: Area = side × side

Triangle: Area = 1/2 × base × height

Circle: Area = π × radius²

4. What is the formula of volume used for?

Volume is an important concept in mathematics and physics, and it has many real-world applications. For example, volume is used to calculate the amount of water in a swimming pool, the amount of air in a balloon, and the amount of concrete required to build a foundation.

5. How to remember formulas of surface area and volume class 9?

You can refer to NCERT Solutions for Class 9 Maths Chapter 11 - Surface Areas And Volumes by Vedantu.