in the given figure the bisectors of the <ABC and <BCA intersect each other at point o. if <NOC=110°,the <A is
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In triangle ABC,
∠A+∠B+∠C=180
∘
..... (1)
OB and OC are bisectors of ∠B and ∠C
So, ∠B=2∠OBC
and ∠C=2∠OCB
Now equation (1) can be written as,
∠A+2(∠OBC+∠OCB)=180
∘
..... (2)
In triangle OBC,
∠BOC+∠OBC+∠OCB=180
∘
∠OBC+∠OCB=180
∘
−∠BOC..........(3)
From (2) and (3),
∠A+2(180
∘
−∠BOC)=180
∘
∠A+360
∘
−2∠BOC=180
∘
∠A+180
∘
=2∠BOC
2
1
∠A+90
∘
=∠BOC
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