1.

From figure, find ∠x. Here BO and CO are bisectors of ∠B and ∠C respectively.

Answer»

We know that

∠BOC = 90° + \(\frac { 1 }{ 2 }\) ∠A

∵ ∠A = 80°

⇒ ∠BOC = 90° + \(\frac { 1 }{ 2 }\) x 80° 

= 90° + 40° = 130°



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