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    Question

    If I is the incentre of ΔABC , if  ∠ BAC = 500

    , then what is the measure of  ∠ BIC?
    A 115˚ Correct Answer Incorrect Answer
    B 117.5˚ Correct Answer Incorrect Answer
    C 120˚ Correct Answer Incorrect Answer
    D 110˚ 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  + 50/2  ∠  BIC = 900 + 250      ∠ BAC = 1150 

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