Perimeter of 2D Shapes
Maths: Edexcel IGCSE Higher, topic 4.7.2
Perimeter
The perimeter of a shape is the sum of its side lengths. It is important to label all side lengths so you don't miss any out.
Example 1
- To find the perimeter of this shape, we need to add all the side lengths together.
Example 1 cont.
Example 2
- To find the perimeter of this shape, we need to add all the side lengths.
Example 2 cont.
Missing length
- Sometimes you might need to work out the missing length of a shape in order to find the perimeter.
- What is the perimeter of the rectangle above?
Missing length
- We use the information that rectangles have two pairs of sides of equal length to work out the length of the missing side.
Test yourself on Perimeter of 2D Shapes
What is the perimeter of the rectangle below?
What is the perimeter of this equilateral triangle?
What is the perimeter of this rectangle?