A circle of radius = 3 or diameter = 6 or circumference = 18.85 centimeters has an area of: 2.827 × 10 -9 square kilometers (km²) 0.002827 square meters (m²) 28.27 square centimeters (cm²) 2827 square millimeters (mm²) 1.09151 × 10 -9 square miles (mi²) 0.00338106 square yards (yd²)

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