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