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Let side of equilateral triangle = $$s$$ cm
Area of equilateral triangle = $$\frac{\sqrt3}{4} (s)^2=36\sqrt3$$
=> $$s^2=36\times4$$
=> $$s=\sqrt{6\times6\times2\times2}$$
=> $$s=6\times2=12$$ cm
=> Ans - (C)
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