O is the orthocentre of ∆ABC, and if ∠ BOC = 110°,

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O is the orthocentre of ∆ABC, and if ∠ BOC = 110°, then ∠ BAC will be

1. 110°
2. 70°
3. 100°
4. 90°

Correct Option: B

Firstly , we draw a figure of triangle ABC whose Point O is the orthocentre ,

From figure ,
∴ ∠ BOC = 180° – ang; A
∴ 110° = 180° – ∠A ( ∴ ∠ BOC = 110° )
⇒ ∠ A = 180° – 110° = 70°