Question

If both pairs of opposite angles of a quadrilateral are __________, then the quadrilateral is a parallelogram.

A)

congruent

B)

complementary

C)

obtuse

D)

supplementary

Answer 1

congruent

Explanation:

Answer 2

Obtuse

Explanation:

Angles of a parallelogram are supplementary to it's adjacent angles . One pair of opposite angles of a parallelogram is obtuse & other pair is acute . Here in the figure , ∠DAB & ∠BCD are obtuse angles and also opposite to each other whereas ∠ADC & ∠ABC are acute angles and are opposite to each other.