Introduction to Enlargement
Learn what enlargement is and how to enlarge a shape using ascale factor and a centre of enlargement. Let’s get started! 🚀
Video Lesson
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Flashcards
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🛎️ What Is Enlargement?
- Enlargement is a transformation that changes the size of a shape.
- All angles stay the same after an enlargement, but the lengths bigger or smaller.
🛎️ Understanding the Scale Factor
- The scale factor is the number you multiply all lengths by.
- If the scale factor is greater than 1, the shape gets bigger, and if it is between 0 and 1, the shape gets smaller.
🛎️ How to Enlarge a Shape from a Centre
- Draw straight lines from the centre of enlargement to each corner.
- Measure the distance from the centre to a corner, then mark the new point 3 times as far from the centre.
🛎️ Finding the Centre of Enlargement
- Join each corner of the original shape to the matching corner of the enlarged shape.
- Extend the lines until they meet at one point, called the centre of enlargement.
🛎️ Finding the Scale Factor
- The scale factor is found using .
- If a side goes from 4 units to 8 units, then , so the scale factor is 2.
- Exam tip: Choose any pair of matching sides. Horizontal or vertical lines on the grid are easiest.
Practice Questions
Test your understanding
Interactive Activity
Learn how to enlarge a shape by a scale factor from a centre of enlargement
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