A) \[\frac{\pi }{6}\]
B) \[\frac{\pi }{3}\]
C) \[\frac{\pi }{2}\]
D) None of these
Correct Answer: D
Solution :
\[\cos C=\frac{{{a}^{2}}+{{b}^{2}}-{{c}^{2}}}{2ab}=-1\] Þ \[\angle C={{180}^{o}}\], which is inadmissible in a triangle.
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