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    Question

    If O is the orthocentre of ΔABC , if ∠ BOC =

    1000 then what is the measure of  ∠ BAC?
    A 70° Correct Answer Incorrect Answer
    B 60° Correct Answer Incorrect Answer
    C 75° Correct Answer Incorrect Answer
    D 80° Correct Answer Incorrect Answer

    Solution

    If O is the orthocentre of ΔABC,  then ∠ BOC + ∠ BAC = 180 0  or 1000   + ∠ BAC  = 180 0     or ∠ BAC = 180 0   - 1000     = 800  

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