Stretching & Shrinking Post
1: Figures are mathematically similar when their corresponding sides have a scale factor and the angles are congruent.
2: Not any two rectangles are similar because even if the corresponding angles are congruent, the figures may not have a scale factor.
3: All equilateral triangles are similar because all the corresponding angles are the same, so the triangles will have a slace factor no matter what.
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