Select the correct answer.
pair 2
pair 3
pair 4
which pairs of polygons are congruent?
a pairs 1. 2. and 3
b. pairs 1. 2. 3. and 4
c. pairs 2 and 3
d. pairs and

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given