Solution
Let the side of equilateral triangle = $$a$$ cm
Area of equilateral triangle = $$\frac{\sqrt{3}}{4} a^2 = 9 \sqrt{3}$$
=> $$a^2 = 9 \times 4 = 36$$
=> $$a = \sqrt{36} = 6$$ cm
$$\therefore$$ Perimeter of equilateral triangle = $$3 a$$
= $$3 \times 6 = 18$$ cm
=> Ans - (A)
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