Solve problems involving the perimeter and side lengths of polygons
I can use knowledge of side lengths and perimeter to solve problems.
Solve problems involving the perimeter and side lengths of polygons
I can use knowledge of side lengths and perimeter to solve problems.
Lesson details
Key learning points
- Perimeter is the sum of the side lengths of a 2D shape.
- Mental and written methods can be used to calculate the perimeter of a 2D shape.
- Combinations of addition, subtraction, multiplication and division can be used to solve problems involving perimeter.
Common misconception
Pupils may think that if they know the perimeter of a shape, and a new shape has been made from duplicates of it, they can simply multiply the perimeter by how many shapes make up the new one.
The lesson highlights this misconception and tackles it but it is worth being aware of it as pupils work. Point out to them that some of the sides from the original shape are now inside the new shapes so do not count as part of its perimeter.
Keywords
Perimeter - The distance around a two-dimensional shape.
Regular - A regular polygon has all sides equal and all angles equal.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
regular triangle
square
regular pentagon
regular hexagon
Exit quiz
6 Questions
