Q5 of 34 Page 252

In the given figure, ∠BOC = ?

Sum of angles in a straight line is 180°

So, ∠AOD + ∠DOC + ∠BOC = 180°


3x + 5x + 4x = 180


12x = 180


x = 15


∠BOC = 4x = 4×15 = 60°.

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