IXL | Area and perimeter of rectangles: find the missing side length

The perimeter of the rectangle is

meters

and the two missing sides have the same length. What is the length of one of the missing

sides?

meters

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Learn with an example

question

The perimeter of the rectangle is

meters

and the two missing sides have the same length. What is the length of one of the missing

sides?

meters

key idea

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

solution

The perimeter of this rectangle is

meters

The lengths of two equal sides are missing.

To find the missing side lengths, write an addition sentence for the perimeter of the rectangle. The perimeter of the rectangle is the sum of all its side lengths.

perimeter

The perimeter is

meters

Add the lengths of the sides you know.

To find the missing lengths, subtract the lengths you know from the perimeter.

–

Together, the two missing side lengths are

meters

Divide 10 by 2 to find the length of each side.

The length of each missing side is

meters

Looking for more? Try these:

Lesson: Rectangles

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Teacher tools

Work it out

Not feeling ready yet? These can help:

PP.2Perimeter of rectangles

OO.10Find the area of rectangles and squares

P.6Subtract two-digit numbers - with regrouping

J.1Division facts to 10

Lesson: Rectangles

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