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    Question

    If I is the incentre of ΔABC , if  ∠ BIC = 1250

     , then what is the measure of  ∠ BAC?
    A 40˚ Correct Answer Incorrect Answer
    B 30˚ Correct Answer Incorrect Answer
    C 20˚ Correct Answer Incorrect Answer
    D 70˚ Correct Answer Incorrect Answer

    Solution

      If I is the incentre of ΔABC,  then ∠ BIC = 90 0    +  ∠ BAC/2   1250   = 90 0    + ∠ BAC /2  1250 - 90 0    = ∠ BAC/2 ∠  BAC/2 = 350      ∠ BAC = 70 0 

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