Correct Answer: Option C

Explanation

Let each side be l, then area = \(l^2\)

Using Pythagoras theorem

\(l^2 + l^2 = 12^2\)

\(2l^2 = 144\)

divide both sides by 2

\(l^2 = 72\)

Therefore, the Area of the square is \(72 cm^2\) 

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