A) \[\frac{49\sqrt{3}}{2}c{{m}^{2}}\]
B) \[\frac{63\sqrt{3}}{2}c{{m}^{2}}\]
C) \[21{{\sqrt{3}}^{2}}\]
D) \[21\sqrt{3}c{{m}^{2}}\]
E) None of these
Correct Answer: A
Solution :
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