1.

In the given figure, \[BO\] and \[CO\] are angle bisectors of external angles of\[\Delta ABC\]. Find\[\angle BOC\].

A. \[{{90}^{o}}-\frac{1}{2}\angle A\]                   
B. \[{{90}^{o}}+\frac{1}{2}\angle A\]
C. \[{{180}^{o}}-\frac{1}{2}\angle A\]     
D.        \[{{180}^{o}}+\frac{1}{2}\angle A\]   
Answer» B. \[{{90}^{o}}+\frac{1}{2}\angle A\]


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