Answer: proportion
Two polygons are similar if and only if there is a proportion that maps a preimage to its image.
Step-by-step explanation: Two polygons are similar if and only if their corresponding angles are congruent and the measures of their corresponding sides are proportional. If two figures are similar, then the measures of the corresponding angles are equal and the ratios of the lengths of the corresponding sides are proportional.
[tex]\textit{\textbf{Spymore}}[/tex]
