## Perimeter of a Rectangle Lesson

### Rectangle Perimeter Formula

The formula for perimeter of a rectangle is given as:

**P = 2(l + w)**

Where *P* is the perimeter, *l* is the length, and *w* is the width.

INTRODUCING

### Perimeter of a Rectangle Example Problems

Let's work through a couple of example problems together to practice finding the perimeter of a rectangle.

#### Example Problem 1

Find the perimeter of a rectangle with a length of 12 and width of 5.

Solution:

- The length and width are given to us. Let's plug the given dimensions into the formula.
- P = 2(l + w) = 2(12 + 5)
- P = 2(17) = 34
**The perimeter of the rectangle is 34.**

#### Example Problem 2

A rectangle has a perimeter of 15 and a length of 5. What is the width?

Solution:

- Let's plug the given dimensions into the formula, then isolate
*w*to find the width. - P = 2(l + w) → 15 = 2(5 + w)
- 15 = 10 + 2w
- 5 = 2w
- w = 2.5
**The width of the rectangle is 2.5.**