Find the supplement of following angles:

$3°$

Finding the supplementary angle.

Supplement angles are angles which add up with other angle to form $180°$.

Let the supplement angle be $x°$

Then, $$\begin{gathered} 3°+x=180° \\ \angle x=180°-3° \\ \angle x=177° \end{gathered}$$

Hence, the supplement of $3°$ is $177°$.