If O is the orthocentre of a ∆ ABC and ∠ BOC = 140°, then the measure of ∠BAC is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 40°
∠BOC + ∠BAC = 180° (This is a standard property when O is the orthocentre of triangle ABC.)
⇒ ∠BAC = 180° − 140° = 40°