Answer:
(a)∠1 and ∠6.
(b)∠5 and ∠6.
(c)∠3 and ∠4.
Step-by-step explanation:
(a)Vertical Angles are angles that form an X-Shape.
A pair of vertical angles is ∠1 and ∠6.
(b)Linear pairs are two angles on a straight line that adds up to 180 degrees.
A linear pair is ∠5 and ∠6.
(c)A pair of supplementary angles are two angles that add up to 180 degrees.
An example is ∠3 and ∠4.