Question 1105294
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The ratio is


{{{((pi*(d/2)^2))/((d^2-pi*(d/2)^2))}}} = {{{((pi/4))/((1-pi/4))}}} = {{{pi/(4-pi)}}} = 3.66 (approximately)
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where d is the diameter of any circle = the side length of the corresponding square in the figure.