Describing a negative enlargement
I can describe an enlargement.
Describing a negative enlargement
I can describe an enlargement.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- If the image is the opposite side of the centre of enlargement and rotated 180°, there is a negative scale factor.
- If the image has changed size, there has been an enlargement with scale factor ≠ 1.
- To describe an enlargement, you must state the centre of enlargement and the scale factor.
Keywords
Transformation - A transformation is a process that may change the size, orientation or position of a shape.
Enlargement - Enlargement is a transformation that causes a change of size.
Scale factor - A scale factor is the multiplier between similar shapes that describes how large one shape is compared to the other.
Centre of enlargement - The centre of enlargement is the point from which a shape is enlarged.
Absolute value - The absolute value of a number is its distance from zero.
Common misconception
Pupils may want to write the transformation as two transformations, a rotation of 180° followed by an enlargement by a positive scale factor, rather than a single transformation.
Remind pupils that a single transformation is more efficient than multiple transformations.
To help you plan your year 10 maths lesson on: Describing a negative enlargement, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 10 maths lesson on: Describing a negative enlargement, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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Explore more key stage 4 maths lessons from the Further transformations unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
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Starter quiz
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Exit quiz
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