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Solution
Let side of equilateral triangle = $$s$$ cm
=> Area = $$\frac{\sqrt3}{4} s^2=25\sqrt3$$
=> $$\frac{s^2}{4}=25$$
=> $$s^2=25\times4=100$$
=> $$s=\sqrt{100}=10$$ cm
=> Ans - (A)
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