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.
Calculate the perimeter of the shape.
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