A) \[\frac{\sqrt{3}}{4}\times {{a}^{2}}\]
B) \[\frac{\sqrt{3}}{4}\times {{b}^{2}}\]
C) \[\frac{\sqrt{3}}{4}\times 49\]
D) \[\frac{\sqrt{3}}{4}\times 81\]
Correct Answer: C
Solution :
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