Final answer:
Quadrilaterals ABCD and EFGH are similar because a translation and a dilation are used to transform ABCD into EFGH, which preserves both proportional sides and congruent angles.
Step-by-step explanation:
Quadrilaterals ABCD and EFGH are similar because a translation of (x+2, y+5) and a dilation by a scale factor of 3 from point A' map quadrilateral ABCD onto EFGH. In order for two quadrilaterals to be similar, corresponding sides must be proportional and corresponding angles must be congruent.
In this case, a translation and a dilation are used to transform ABCD into EFGH, which preserves both proportional sides and congruent angles. Therefore, quadrilaterals ABCD and EFGH are similar.