Question

618. Which angles are supplementary to 21? Whichare congruent to _1? SEE EXAMPLE 2zalona, 61/23/45/67/8

Answer 1

Consider the image below

Supplementary angles are angles that sum up to 180 degree

`\begin{gathered} \text{Sumplementary angles to }\angle1\text{ are } \\ \angle2\text{ and }\angle3 \\ \angle1+\angle2=180^0(sum\text{ of angle on a straight line )} \\ \angle1+\angle3=180^0(sum\text{ of angle on a straight line )} \end{gathered}`

Similarly,