Question
If O is the orthocentre of ΔABC , if ∠BOC =
1250 then what is the measure of ∠BAC?Solution
If O is the orthocentre of ΔABC, then ∠BOC + ∠BAC = 180 0 or 1250  + ∠BAC  = 180 0   or ∠BAC = 180 0  - 1250   = 550 Â
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