IXL | Compare area and perimeter of two figures

Which figure has a greater perimeter?

6 in

9 in

7 in

9 in

7 in

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Learn with an example

question

Which figure has a greater perimeter?

4 in

2 in

key idea

Perimeter of a pentagon:

You find the perimeter by adding the lengths of the sides.

Perimeter of a octagon:

You find the perimeter by adding the lengths of the sides.

solution

First, find the perimeter of the pentagon.

Look at the shape and find the length of each side. Add the lengths:

4 + 4 + 4 + 4 + 4 = 20

The perimeter of the pentagon is 20 inches.

Now find the perimeter of the octagon.

Look at the shape and find the length of each side. Add the lengths:

2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 = 16

The perimeter of the octagon is 16 inches.
The perimeter of the pentagon is greater.

Looking for more? Try these:

Lesson: Perimeter

Lesson: Area of triangles

Lesson: Area of parallelograms

Lesson: Area of trapezoids

$Confetti$

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Teacher tools

Work it out

Not feeling ready yet? These can help:

GG.1Perimeter

GG.6Area of triangles

GG.10Area of quadrilaterals