because if you shrink or grow a similar figure, it would be congruent.
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No. Two figures are similar if they have same shape, and all the angles are equal; but they can have the sides of different sizes. I mean, similar figures may have different sizes, but must have the same shape.
When they have the same interior angles but different side lengths
When two figures are similar it means that its the same size and length and that they both have same features in other words it means that its congruent.Simply put :they have the same shape, same angles and proportional side lengths.
Two figures are similar if: - The measures of their corresponding angles are equal. - The ratios of the lengths of the corresponding sides are proportional.
Two congruent geometric figures have the same shape and the same size, whereas two similar geometric figures have the same shape but they differ in size.