Describing a negative enlargement
I can describe an enlargement.
Describing a negative enlargement
I can describe an enlargement.
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.
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).
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