Find the Perimeters of 2D Shapes

In this activity, we will find the perimeters of 2D shapes.

 

The perimeter of a shape is the total length of the sides enclosing it.

That means we add the lengths of all the sides together to find the perimeter.

 

Example

Calculate the perimeter of the triangle below.

 

 

 

Answer

Perimeter of the triangle is 

10 cm + 7 cm + 5 cm = 22 cm

 

Easy right?

Some people get mixed up with perimeter and area!

 

Just imagine you are a footballer walking the perimeter of the pitch.

You would start at one corner and walk along all four sides before arriving back at the beginning.

The distance you have walked is the length of the four sides added together!

 

 

Let's try some questions with different shapes.

Remember, the perimeter is all the sides around the outside added together, whatever the shape may be!