Answer :
Two angles are supplementary when they add up to 180°.
In diagram above
A and C are supplementary because they add up to 180° 60+112 =180
Same with B and D
90+90=180

Two angles are supplementary when they add up to 180°.
In diagram above
A and C are supplementary because they add up to 180° 60+112 =180
Same with B and D
90+90=180