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

Perimeter is the total distance around the outside of a 2D shape. You can calculate it 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.

**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