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If the corressponding angles of 2 polygons are congruent and the lengths of the corresponding sides of the polygons are proportional the polygons are..

a. Regular
b. Congruent
c. Symmetrix
d. Similar

"If the coressponding angles of 2 polygons are congruent"
then the two polygons are either congruent or similar.

If, in addition, the lengths of the sides are proportional (i.e. may or may not be congruent), then we cannot say that they are congruent, so they are similar.

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