Step-by-step explanation:
"complimentary" means together they have 90°.
"supplementary" means together they have 180°.
which can be easily and quickly found on any internet search.
7.
A = 70°
A + B = 90°
70 + B = 90
B = 90 - 70 = 20°
B + C = 180°
20 + C = 180
C = 180 - 20 = 160°
8.
A + B = 90°
B + C = 180°
C = 100°
B + 100 = 180°
B = 180 - 100 = 80°
A + 80 = 90
A = 90 - 80 = 10°
