IXL | Understanding area and perimeter of rectangles

This rectangle is made of unit squares. It is 2 units wide and 5 units long.

Which equation can you use to find the area,

of the rectangle?

Now, use the equation you picked to find the area of the rectangle.

square units

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Learn with an example

question

This rectangle is made of unit squares. It is 7 units long and 3 units wide.

Which equation can you use to find the perimeter,

of the rectangle?

Now, use the equation you picked to find the perimeter of the rectangle.

units

key idea

The perimeter of a shape is the distance around the outside of the shape.

A unit square is a square whose area is 1 square unit. The sides of a unit square are 1 unit long.

solution

To find the perimeter,

find the distance around the rectangle. The rectangle is 3 units wide and 7 units long.

7 units

3 units

So, add 7 units twice (once for the top and once for the bottom) and add 3 units twice (once for the left side and once for the right side).

You can use this equation to find the perimeter,

The perimeter of the rectangle is 20

units.

Notice that

is the same as

(

)

(

)

You can check that using this equation gives the same answer.

(

)

(

)

Multiply inside the parentheses

Add

Looking for more? Try these:

Lesson: Rectangles

$Confetti$

Excellent!

Now entering the Challenge Zone—are you ready?

Teacher tools

Work it out

Not feeling ready yet? These can help:

II.1Create rectangles with a given area

PP.2Perimeter of rectangles

Lesson: Rectangles

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