How many percent less is the area of the circle than that of the square?

Draw the largest circle in a square with a side length of 8 decimeters. The area of the circle is π × 4 & # 178; = 16 π decimeters & # 178;
The area of a circle is less than that of a square by (8 × 8-16 π) / (8 × 8) = 21.5%

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