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  1. O is the orthocentre of ∆ ABC. Then ∠BOC + ∠BAC is equal to
    1. 120°
    2. 135°
    3. 180°
    4. 90°
Correct Option: C

Firstly , We draw a figure in which O is the orthocentre of ∆ ABC ,

∴ ∠BOC = 180° – ∠A
⇒ ∠BOC + ∠BAC = 180°


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