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Question
Find y in the given figure.

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Solution
∵ AOC is a straight line
∴ ∠AOB + ∠BOD + ∠DOC = 180°
⇒ y + 150°− x + x = 180°
⇒ y + 150° = 180°
⇒ y = 180°− 150° = 30°
Hence, y = 30°
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