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They are all different sizes. However, we say that they are all similar shapes.

Scale factor

When describing enlargements you must state by how much the shape has been enlarged. This is called the scale factor.

For example, a scale factor of means that the side-lengths of the new shape are twice the side-lengths of the original. A scale factor of means that the side-lengths of the new shape are three times the side-lengths of the original.

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BBC Bitesize - KS3 Maths - Transformations and enlargements - Revision 6

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They are all different sizes. However, we say that they are all similar shapes. When describing enlargements you must state by how much the shape has been enlarged. This is called the scale factor. For example, a scale factor of means that the side-lengths of the new shape are twice the side-lengths of the original.

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First draw lines from point O through A, B and C, as shown in the diagram. Measure the length O A and multiply it by 3 to get the distance from O of the image point A', i.e. O A' = 3 × O A. Mark the point A' on the diagram.

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Maths Made Easy! Transformations #4: Enlargement [O&U Learn]

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Maths Made Easy! Transformations #4: Enlargement [O&U Learn]