∠S and ∠U are supplementary and ∠T and ∠S are supplementary. Complete the proof that ∠U≅∠T.

Two angles are called supplementary when their measures add up to 180 degrees.
The angles T and S are given to be supplementary. This means that:
[tex]m\angle T+m\angle S=180\degree[/tex]ANSWER
Definition of supplementary angles.