CAT Quantitative Ability Questions | CAT Mensuration questions

CAT/1997

Question . 75

The adjoining figure shows a set of concentric squares. If the diagonal of the innermost square is 2 units, and if the distance between the corresponding corners of any two successive squares is 1 unit, find the difference between the areas of the eighth and the seventh square, counting from the innermost square

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Method of solving this CAT Quantitative Ability Question from Mensuration question