Perimeter: How Big is the Polygon?

In this worksheet, work out the perimeter of a regular 2D polygon.

Perimeter is the total distance around the outside of a 2D shape. Calculate the perimeter by adding together the length of all the sides.

Remember that in a regular polygon, all the sides are the same length.

Example

Calculate the perimeter of the shape.

3 cm

Answer

First count the number of sides.

There are 5 sides in this shape (pentagon).

It is regular so each side is 3 cm long.

The perimeter is 5 x 3 = 15 cm

Remember the answer is 15 cm not just 15.