Question
If O is the orthocentre of ΔABC , if ∠ BOC =
105 0 then what is the measure of ∠ BAC?Solution
If O is the orthocentre of ΔABC, then ∠ BOC + ∠ BAC = 180 0 or 105 0 + ∠ BAC = 180 0 or ∠ BAC = 180 0 - 105 0 = 750
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