Remember: The perimeter is the total distance around a shape.
Add the lengths of all sides. For a rectangle: P = 2(length + width).
For a square: P = 4 × side.
Instructions
Look at each shape carefully and add up all the side lengths. Write your answer in the box and make sure the units (cm, m, mm, km) match the shape. Click Check Answers when you're finished.
1
Squares & rectangles
Add up all four sides to find the perimeter.
2
Triangles & irregular shapes
Count every side — irregular shapes have more than four!
3
Find the missing side
The perimeter is given — work backwards to find the missing side (marked ?).