A) \[30{}^\circ \]
B) \[60{}^\circ \]
C) \[90{}^\circ \]
D) \[150{}^\circ \]
Correct Answer: C
Solution :
\[n=\left( \frac{360}{\theta }-1 \right)\]\[\Rightarrow 3=\left( \frac{360}{\theta }-1 \right)\Rightarrow \theta =90{}^\circ \]
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