Finding the perimeter of a rectilinear shape
Home learning focus
Learn how to find the perimeter of a rectilinear shape.
This lesson includes:
- one video
- three interactive activities
What is the perimeter?
This shape looks much more complicated than a rectangle, but the method of working out the perimeter is exactly the same.
Add together the lengths of all the sides to find it.
2 + 2 + 3 + 3 + 5 + 5 = 20
The perimeter is 20 cm
Finding the unknown sides
Watch the video below from BBC Bitesize on finding the perimeter of a rectilinear shape when you don't know the length of every side.
A rectilinear shape is a shape that has straight sides and right angles.
Make a shape
Cut out 12 squares of paper of equal size or use 12 square sticky notes (you may have these from yesterday's activity). Arrange them into a rectilinear shape.
What is the perimeter of this shape?
Now rearrange the pieces of paper into a new shape. How many different shapes can you make and find the perimeter of?
There's more to learn
Have a look at these other resources around the BBC and the web.