In a square with an area of 20 square centimeters, draw the largest circle. What is the area of this circle in square centimeters?

Square side length = root 20 = 2 root 5
Radius of circle = 2 radical 5 / 2 = radical 5
Area of circle = (radical 5) ^ 2 * 3.14 = 15.7 square centimeter

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