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## Perimeter of a Rectangle

#### Introduction

The perimeter of a rectangle can be described as the distance around all four sides of the rectangle. The green box around the rectangle below indicates the perimeter of the rectangle.

#### Terms

**Rectangle**- A polygon with four straight sides and four right angles, esp one with unequal adjacent sides.

**Perimeter**- The distance around all the edges of a geometric figure.

## Lesson

Calculating the perimeter of a rectangle is as easy as simply adding the lengths of all the sides together. The formula for this calculation is:

Perimeter of a Rectangle Formula

$Perimeter = 2*b + 2*h$

where ‘b’ is the base length, and ‘h’ is the height

So for a rectangle with a base of 5 and a height of 2, the perimeter would be: $5 + 5 + 2 + 2 =$

$2*5 + 2*2 =$

$10 + 4 = 14$

## Examples

#### Perimeter of a Rectangle (Example #1)

Perimeter = 2 * Length + 2 * Width

Perimeter = 2 * $9$ + 2 * $12$

$\text{Perimeter} = 18 + 24$

$\text{Perimeter} = 42$

#### Perimeter of a Rectangle (Example #2)

Perimeter = 2 * Length + 2 * Width

Perimeter = 2 * $8$ + 2 * $13$

$\text{Perimeter} = 16 + 26$

$\text{Perimeter} = 42$

#### Perimeter of a Rectangle (Example #3)

Perimeter = 2 * Length + 2 * Width

Perimeter = 2 * $15$ + 2 * $12.5$

$\text{Perimeter} = 30 + 25$

$\text{Perimeter} = 55$

#### Perimeter of a Rectangle (Example #4)

Perimeter = 2 * Length + 2 * Width

Perimeter = 2 * $14.9$ + 2 * $10.1$

$\text{Perimeter} = 29.8 + 20.2$

$\text{Perimeter} = 50$