The scale factor a shape and its image is the constant of proportionality (ratio) between the lengths of their corresponding sides.
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The perimeter will scale by the same factor.
Perimeter will scale by the same factor. Area of the new figure, however is the original figures area multiplied by the scale factor squared. .
If the sides of two shapes have a scale factor of sf:1, then their areas will be in the ratio of sf2: 1.
The scale factor is the number that the side lengths of one figure can be multiplied by to give the corresponding side lengths of the other figure.
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