Question

to prove similarity, the corresponding side lengths of two figures must be: a. equal b. perpendicular c. congruent d. proportional

Explanation:

Similar figures have the same shape but not necessarily the same size. The key property for proving similarity is that the corresponding side - lengths of two figures are proportional. Equal and congruent side - lengths are for congruent figures, and perpendicularity is related to angle relationships rather than similarity of side - lengths.

Answer:

d. Proportional