What are supplementary angles?

Answer 1

supplementary angles are angles that have a sum of 180*.

another way to remember that its 180* is the two p's in the word make 8.

example. 70*+110*= 180* supplementary.

Complementary angles add up to 90 degrees.
Supplementary angles are two angles whose sum add up to 180 degrees. Can be shown as (180 - x)

Answer 2

Supplementary angles are angles that have a combined sum of 180 degrees.

Usually its two angles. But I can imagine that the triangles three interior angles are supplementary since they also sum to 180 degrees.