A) \[\phi >150{}^\circ \]
B) \[\phi \ge 150{}^\circ \]
C) \[\phi \le 150{}^\circ \]
D) \[\phi <150{}^\circ \]
Correct Answer: A
Solution :
Given, \[\theta <\frac{1}{3}\] of \[{{90}^{o}}={{30}^{o}}\] But \[\theta +\phi ={{180}^{o}}\] or \[\theta ={{180}^{o}}-\phi \] \[\therefore \] \[180-\phi <{{30}^{o}}\] or \[{{180}^{o}}-{{30}^{o}}<\phi \] or \[\phi <{{150}^{o}}\]
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