IXL | Find the perimeter of rectangles using formulas

What is the perimeter of this rectangle?

inches

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Learn with an example

question

What is the perimeter of this rectangle?

meters

key idea

The perimeter of a shape is the total length of the shape's sides.

You can find the perimeter of a rectangle with this formula:

ℓ

where

ℓ

is the length and

is the width. This is another way to write the formula:

(

ℓ

)

(

)

solution

Look at the rectangle. Its length is 4 meters, and its width is 5 meters.

So, plug

ℓ

and

into the formula for the perimeter of a rectangle.

(

ℓ

)

(

)

(

)

(

)

The perimeter of the rectangle is 18

meters.

Looking for more? Try these:

Lesson: Perimeter

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Lesson: Perimeter

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