In the figure below, AB is a straight line and ∠BOC = 65 o . The measure of ∠AOC is ____.
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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.

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