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# Area of a Rectangle

(KS3, Year 7)

## The Lesson

The area of a rectangle is found using the formula:In this formula,

**b**is the length of the base of the rectangle and

**h**is the height of the rectangle. The image below shows what we mean by the length of the base and the height:

## How to Find the Area of a Rectangle

Finding the area of a rectangle is easy.## Question

What is the area of a rectangle with a base of 8 cm and a height of 5 cm, as shown below?## Step-by-Step:

# 1

Start with the formula:

Area = bh

**Don't forget:**bh = b × h# 2

Substitute the length of the base and the height into the formula. In our example, b = 8 and h = 5.

Area = 8 × 5 = 40 cm

^{2}## Answer:

The area of the rectangle with a base of 8 cm and a height of 5 cm is 40 cm^{2}.

## "Find the Area" Widget

## What Is a Rectangle?

A rectangle is a flat shape with four straight sides and four right angles. The opposite sides are parallel and of equal length. Adjacent sides are perpendicular and of unequal length.## A Note on Units

The area of a rectangle is a length times a length, so we say its dimension is length^{2}. (All areas are lengths squared). This affects the units used. If the lengths of a rectangle are in cm, the area is in cm

^{2}. If the lengths are in inches, the area is in inches

^{2}.

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