Answer:
4. Angle 1 + Angle 3 = 180 degrees, Angle 2 + Angle 3 = 180 Degrees
5. Angle 1 + Angle 3 = Angle 3 + Angle 2
Step-by-step explanation:
Supplementary means that two angles next to each other are equal to 180 degrees. Using that both angle 1 and 3 as well as angle 2 and 3 are equal to 180 degrees, we can plug each equation in on opposite sides of the = sign.
