Solution
Let side of square = $$a$$ cm
Diagonal of square = $$d=12$$ cm
=> $$(a)^2+(a)^2=(d)^2$$
=> $$2a^2=(12)^2=144$$
=> $$a^2=\frac{144}{2}=72$$
=> $$a=\sqrt{72}=6\sqrt2$$ cm
=> Ans - (A)
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