



 
Hi Rajesh. The length of the diagonal of a square is SQRT(2) times the length of a side. You can prove this to yourself by using the Pythagorean Theorem. Therefore the area of the square is A = D^{2}/2, where D is the length of the diagonal. So add up the length of the diagonals of each of the two squares, calculate the areas and subtract. Cheers,  


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