A) \[{{60}^{o}}\]
B) \[{{30}^{o}}\]
C) \[{{90}^{o}}\]
D) \[{{45}^{o}}\]
Correct Answer: B
Solution :
\[\Delta =\frac{1}{2}bc\sin A\Rightarrow 9=\frac{1}{2}.36\sin A\] Þ \[\sin A=\frac{1}{2}\Rightarrow A=\frac{\pi }{6}=30{}^\circ \].
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