To answer this question, we need to remember the definitions of the angles.
• Adjacent angles share a common vertex and a side
,
• When two lines intersect each other, then the pair of opposite angles formed at the vertex are called vertical angles.
,
• Pair of adjacent angles whose measures add up to form a straight angle is known as a linear pair.
With the definitions in mind, we have:
a) adjacent
b) linear pair
c) linear pair
d) Vertical angles
e) None
