AQA · Mathematics · 8300
GCSE Maths: Enlargements: ray method
Geometry & Measures · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths textbook exercise for Enlargements: ray method (Corbettmaths Video 109), and every card links back to the exact page it came from. Practice tests are drawn from this deck’s own cards. Source material © Corbettmaths — used with attribution.
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In the ray method of enlargement, what does the centre of enlargement represent?
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The fixed point from which all rays are drawn through the vertices of the original shape to locate the vertices of the enlarged shape.
What happens to the distances from the centre of enlargement when applying a scale factor of 3?
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All distances from the centre of enlargement to each vertex are multiplied by 3.
What is the effect of a scale factor of ½ on an enlargement?
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The image becomes smaller than the original, with distances from the centre of enlargement reduced to half.
What does a negative scale factor do to an enlarged shape?
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It produces an image on the opposite side of the centre of enlargement, inverted relative to the centre.
How can you find the centre of enlargement given an original shape and its enlarged image?
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Draw lines through corresponding vertices of the original and enlarged shapes; the lines will intersect at the centre of enlargement.
Does a scale factor of ½ count as an 'enlargement' in mathematical terminology?
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Yes, in mathematics the term 'enlargement' includes reductions (scale factors less than 1).
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