Transformations and vectors
Lesson 13 of 14
Negative and fractional enlargements
Objective. Enlarge a shape by a fractional or negative scale factor.
The key idea
A fractional scale factor shrinks the shape; a negative scale factor also puts it on the opposite side of the centre, upside down.
Worked example
Enlarge point (4, 2) by scale factor −1/2 about the origin.
- 1Multiply each coordinate by −1/2.
- 24 × −0.5 = −2 and 2 × −0.5 = −1.
Answer: (−2, −1)
Practice
Each question comes with a picture and a listen button. Try it first, then reveal the answer.
Common mistake. Shrinking the shape but forgetting to flip it for a negative factor.
Your progress
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