In the figure below, AB is a straight line and ∠BOC = 65 o . The measure of ∠AOC is ____.
A) 145 o
B) 115 o
C) 125 o
D) 165 o
In the figure AB is a straight line & angle BOC & angle AOC are supplementary angles.
When the sum of two angles equal to 180 Deg then the angles are called supplementary angles.
So the angle AOC = 180 - 65 = 115 Deg.
Ans.: B = 115 Deg.