question_answer

If the difference between the areas of the circumcircle and in circle of an equilateral triangle is 77\[\mathbf{c}{{\mathbf{m}}^{\mathbf{2}}}\], then the area of the triangle (in \[\mathbf{c}{{\mathbf{m}}^{\mathbf{2}}}\]) is ________

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