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.

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