Key learning points

1. The perimeter of any polygon can be found by summing the sides.
2. The perimeter of shapes made from polygons can be found.
3. Some methods for finding perimeters are more efficient than others.
4. Missing lengths can be found when the perimeter is known.

Common misconception

Keywords

• Perimeter - the distance around a 2D shape

• Polygon - flat (2D), closed figure made up of straight line segments

• Compound/composite shape - a shape created using two or more basic shapes