1.How are the two angles below related?

Drawing not to scale.
45°
135°

supplementary

adjacent***
complementary
vertical

(I think the answer is adjacent, please correct me if I'm wrong)

You may be right, but I have no diagram, so it's hard to say; but they do add up to 180°, so they are also supplementary.

The correct answer is supplementary

The two angles given, 45° and 135°, are related as complementary angles.

Complementary angles are two angles whose sum is 90°. In this case, if we add 45° and 135° together, we get 180°, which is a complete angle. Therefore, they are complementary angles as they add up to 90°.

To determine the relationship between two angles, you can add them together and check if the sum is 90° (complementary angles), 180° (supplementary angles), or any other specific relationship mentioned.