Respuesta :

StarCatz

Answer:

for 1 it is they are symmetrical s the angles will be the same no matter what

Step-by-step explanation:
1) Given
2) their 2 non-common sides in 1 ray
3) definition of: supplemental angles
4) substitution
5) opposite angles are congruent (equal)
6) substitution
7) definition of supplementary angles