The circle's area is about 13.45 square units.
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If the circumference of a circle is 6.28 then its area is about 3.138 square units
The radius of a circle with a circumference of 13 feet is: 2.069 feet.
The circumference of a circle with a diameter of 13 mm is: 40.84 mm
The area of circle with a circumference of 20 is: 31.83 units squared.
The circumference of a circle with an area of 3 acres is: 1,281 feet.