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    Question

    If I is the incentre of ΔABC , if  ∠ BAC = 300

    , then what is the measure of  ∠ BIC?
    A 130˚ Correct Answer Incorrect Answer
    B 105˚ Correct Answer Incorrect Answer
    C 112.5˚ Correct Answer Incorrect Answer
    D 122.5˚ Correct Answer Incorrect Answer

    Solution

      If I is the incentre of ΔABC,  then ∠ BIC = 90 0  +  ∠ BAC/2   ∠ BIC  = 90 0  + ∠ BAC /2  ∠ BIC = 900  + 30/2  ∠  BIC = 900 + 150      ∠ BAC = 1050 

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