This activity is about finding the perimeter of regular 2D shapes. A regular shape is a polygon with sides that are all equal in length.
The perimeter is the total distance around the outside of a 2D shape. We can calculate the perimeter by adding together all the lengths of the sides.
What is the length of one side?
|Perimeter: 70 cm|
First, count the number of sides.
There are 10 in this regular shape. It is a decagon.
If the length of 10 equal sides adds to 70 cm, we can divide to find the length of one side.
70 ÷ 10 = 7
Each side is 7 cm long.
Remember to put cm in the answer.
Let's have a go at some questions now.