The sum of the perimeter of a circle and a square is \( \mathrm{K} ...

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The sum of the perimeter of a circle and a square is \( \mathrm{K} \), where \( \mathrm{K} \) is some constant. Prove that the sum of
\( \mathrm{P} \) their areas is least when the side of the square is double the radius of the circle.

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