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Similarity (F)
All the triangles in the diagram above are similar – except one. Which triangle is the odd man out? Question 8 awaits your answer...

Similarity (F)

If you have already tried the Congruence and Mathematical Definitions quizzes you will have a good understanding of similarity, but how well can you apply it? Test yourself in the GCSE Maths quiz!

Similarity is very close to congruence, but is slightly relaxed in that the length of corresponding sides don’t have to be equal, but they do have to have the same scale factor. Therefore, similarity is also connected with ENLARGEMENT. If we enlarge a shape, we apply a scale factor to each side. The new shape, the image, will be similar to the original shape, the object. The corresponding angles won’t have changed.

One way to look at similarity problems is to identify pairs of corresponding sides. Does each pair have the same scale factor? If so, then the two shapes are similar.

Question 1
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Question 6
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Question 8
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Question 9
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Question 10
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Author:  Frank Evans

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