<P> Two geometrical objects are called similar if they both have the same shape, or one has the same shape as the mirror image of the other . More precisely, one can be obtained from the other by uniformly scaling (enlarging or reducing), possibly with additional translation, rotation and reflection . This means that either object can be rescaled, repositioned, and reflected, so as to coincide precisely with the other object . If two objects are similar, each is congruent to the result of a particular uniform scaling of the other . A modern and novel perspective of similarity is to consider geometrical objects similar if one appears congruent to the other when zoomed in or out at some level . </P> <P> For example, all circles are similar to each other, all squares are similar to each other, and all equilateral triangles are similar to each other . On the other hand, ellipses are not all similar to each other, rectangles are not all similar to each other, and isosceles triangles are not all similar to each other . </P>

When do we say that 2 polygons are similar
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