Answer:
5. a. Consecutive interior angles.
These types of angles are supplementary.
b. x + 75 +x +125 = 180
=> 2x = 180–200
=> 2x = –20
=> x = –20/2
=> x = –10
Bonus question:-
angle 1 = 48°
angle 2 = 180° –78°
= 102°
value of f :-
f + 48 + 102 = 180
=> f + 150 = 180
=> f = 180–150
=> f = 30°