Question
If I is the incentre of ΔABC , if ∠BAC = 800
, then what is the measure of ∠BIC?Solution
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If I is the incentre of ΔABC, then ∠BIC = 90 0  + ∠BAC/2  ∠BIC = 90 0   + ∠BAC /2 ∠BIC = 900  + 80/2 ∠ BIC = 900 + 400    ∠BAC = 1300Â
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