IXL | Solve problems involving the area and perimeter of rectangles

Justin visited an outdoor nature park with his family. The park is shaped like a rectangle with an area of 48 square kilometers and a width of 4 kilometers. What is the perimeter of the park?

kilometers

ref_doc_title.

Learn with an example

question

A farmer plants pumpkins in a rectangular field. The field has a perimeter of 210 meters and a length of 80 meters. What is the area of the field?

square meters

key idea

Perimeter is the distance around a shape. You can use this formula to find the perimeter of a rectangle:

(

)

(

)

Area is the number of unit squares it takes to cover a shape. You can use this formula to find the area of a rectangle:

In these formulas, is the length of the rectangle, and

is the width.

solution

The field is shaped like a rectangle. It has a perimeter of 210 meters and a length of 80 meters. Its width is unknown.

To find the area of the field, first find its width. Here's one way: subtract the length from the perimeter two times and then divide by 2.

(

210

–

)

(

130

–

)

The field is 25 meters wide.

Now, use the length and width of the field to find its area.

2,000

The area of the field is 2,000 square

meters.

$Confetti$

Excellent!

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Not feeling ready yet? This can help:

II.9Relationship between area and perimeter

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