Solution
Let side of equilateral triangle = $$s$$ cm
Area of equilateral triangle = $$\frac{\sqrt3}{4} (s)^2=49\sqrt3$$
=> $$s^2=49\times4$$
=> $$s=\sqrt{7\times7\times2\times2}$$
=> $$s=7\times2=14$$ cm
=> Ans - (B)
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