Question
If I is the incentre of ÎABC , if â BIC =
112.5°  , then what is the measure of â BAC?Solution
 
If I is the incentre of ÎABC, then â BIC = 90 0   + â BAC/2  112.50  = 90 0   + â BAC /2 112.50 - 90 0   = â BAC/2 â  BAC/2 = 22.50    â BAC = 45 0Â
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