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

An Area is defined as the total space occupied by a two-dimensional flat surface. It is mainly measured in square units. Total Surface Area and Curved Surface Area are two different types of an Area.

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

The sum of the areas of all the surfaces of a 3D shape is termed as the surface area. The surface area of a closed surface includes its length, width (w), and its height (h).

Volume is the measuring quantity which is mainly used to measure the amount of space occupied by a closed surface. Volume is mainly measured in the cubic metre. The formulas for calculating the Surface Areas and Volumes varies for different geometrical shapes.

## Frequently asked Questions on CBSE Class 9 Maths Notes Chapter 13: Surface Areas and Volumes

### What is ‘Surface area’?

Surface area is the amount of space covering the outside of a three-dimensional shape.

### How can ‘Volume’ be defined?

Volume is the quantity of three-dimensional space occupied by a liquid, solid, or gas.

### What is ‘Cubic’ measurement?

It is a unit (such as cubic inch or cubic centimeter) for measuring volume)