Key learning points

1. The perimeter of any polygon can be found by adding but this may be time consuming.
2. By considering the properties of the shape, there may be a more efficient method.
3. There is a formula to find the perimeter of rectangle.
4. Missing side lengths can be found if the perimeter is known.

Common misconception

Keywords

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

• Polygon - A polygon is a flat (2D), closed figure made up of straight line segments.