Answer :
Answer:
mAngleB= 50
mAngleC= 130
Explanation:
Complementary angles = 90
So If angle A is 40 subtract that to 90 to find angle B which is 50
and 50+40= 90 = Complementary !
Supplementary angles = 180
So if angle C is supplementary to angle B you would need to subtract 50 from 180 to find angle C which is 130
130+20= 180 = suplementary !