Wo polygons are similar if their corresponding angles are __________ and their corresponding sides are __________.
a. congruent . . . congruent
b. congruent . . . proportional
c. proportional . . . congruent
d. proportional . . . proportional
The angles must be congruent because otherwise the second polygon is completely different from the first one. The sides must be proportional, because similar polygons are scale models of each other.
