2. Similarity and Transformations
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Two figures are similar when they have the same shape.
Always
Explanation: See solution.
Transformations such as translations, reflection and rotations are called rigid motions which means the image retains the size and shape of it's preimage. Therefore, such transformation result in similar figures.
Dilations increase or decrease the size of a figure without changing the shape of the figure. Therefore, such a transformation also result in similar figures.