Describe the relationship between scale factors and perimeters of two shapes
I can describe the relationship between scale factors and side lengths and perimeters of two shapes.
Describe the relationship between scale factors and perimeters of two shapes
I can describe the relationship between scale factors and side lengths and perimeters of two shapes.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- If the lengths of the sides of a shape have been doubled, the perimeter will be double.
- If the side lengths of a shape are multiplied by the same factor the perimeter will be multiplied by the same factor.
- The number which all the sides have been multiplied by is called a scale factor.
Keywords
Perimeter - Perimeter is the distance around a two-dimensional shape.
Scale factor - A scale factor is the multiplier between similar shapes that describes how large one shape is compared to the other.
Similar - Two shapes are similar when one shape can become the other after a resize, flip, slide or turn.
Common misconception
Pupils may remember to scale one of the sides (or pairs of sides) of a shape but forget to scale the others.
Focus attention on what it means when a shape is similar, drawing on examples and non-examples to support learners to understand how scaling affects all side lengths.
Licence
Lesson video
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Starter quiz
6 Questions
Change something
Make something larger
Make something smaller
30
28
24
27