Key learning points

1. Before calculating perimeter, consider the shape and check you know the required lengths.
2. It is not necessary to know every side length.
3. Sometimes you can deduce the sum of a subset of side lengths.
4. Identifying where you can be more efficient can make calculations simpler.

Keywords

• Perimeter - The perimeter is the distance around a 2D shape.

• Compound shapes - A compound shape is a shape created using two or more basic shapes.

• Composite shapes - A composite shape is an alternative for a compound shape.

Common misconception