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Question

In a triangle ABC, B=60o and C=80o. Suppose the bisector of B and C meet at I. Find BIC.

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Solution

Bisector of B divides the angle into two equal angles
B=300
Similarly, C=400
For BIC
IBC=300
ICB=400
The sum of interior angles of a triangle is 180
BIC+30+40=1800
BIC=1100

949915_558276_ans_2cba0463bb024ff39a1c33d4b407d304.png

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