Answer:
Step-by-step explanation:
(a). Opposite angles formed when the two lines cross each other at a point are called as vertical angles.
Therefore, ∠2 and ∠3 is a pair of vertical angles.
(b). Two adjacent angles on a straight line are linear pair of angles.
∠2 and ∠4 are linear pair of angles.
(c). Linear pair of angles are supplementary.
Therefore, ∠2 and ∠4 are supplementary angles.
m∠2 + m∠4 = 180°
