A) \[{{45}^{o}}\]
B) \[{{60}^{o}}\]
C) \[{{90}^{o}}\]
D) \[{{30}^{o}}\]
Correct Answer: D
Solution :
\[R=4H\cot \theta ,\]if R =\[4\sqrt{3}H\]then \[\cot \theta =\sqrt{3}\]Þ \[\theta =30{}^\circ \]
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