Alright, lets get started.
We have given angle A = 40°
We are also given angle B is complement of A.
Complementary angles are two angles whose sum is 90, it means
angle B = [tex] 90- A [/tex]
angle B = [tex] 90 - 40 [/tex]
angle B = 50° Answer
Now given, angle C is supplement of angle B.
Supplementary angles are two angles whose sum is 180°.
Means angle C = [tex] 180 - B [/tex]
angle C = [tex] 180 - 50 [/tex]
angle C = 130° : Answer
Means angle B = 50° and angle C = 130°
Hope it will help :)