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Year 7 - Maths

Introduction to enlargements

Transformations

Unit Summary

This unit introduces pupils to shape tranformations: enlargements, rotations, reflections and translations both by hand and with technology.

Lesson Summary

You will learn to understand the nature of enlargements and appreciate what changes and what is invariant.

Key Notes

  • An enlargement means a change in size.
  • The lengths of the lines may change when enlarged.
  • The angles inside an object do not change when enlarged.
  • When an object is enlarged, the image is similar.

Vocabulary To Learn

  • Enlargement: Enlargement is a transformation that causes a change of size.
  • Similar: Two shapes are similar if the only difference between them is their size. Their side lengths are in the same proportions.

Common Mistakes To Avoid

  • Enlargement only refers to an increase in size.

3 Quick Questions (With Answers)

1. Solve this in steps: explain the method from this lesson and why each step matters.

An enlargement means a change in size. The lengths of the lines may change when enlarged.

2. Use this key word in a maths sentence and explain it clearly. 'Enlargement'

Enlargement is a transformation that causes a change of size. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Enlargement only refers to an increase in size. Correction: The transformation 'enlargement' refers to a change of size that can be either a stretch or a shrink.

More Lessons In This Unit

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