The area of circle with a circumference of 20 is: 31.83 units squared.
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Circumference of the circle is: pi*20'
If the circumference of a circle is 6.28 then its area is about 3.138 square units
If the circle is 20 ft radius, the area is π·20² = 1256.637 ft² If the circle is 20 ft diameter, the area is π·(20/2)² = 314.1593 ft² If the circle is 20 ft circumference, the are is π·(20/2π)² = 63.66198 ft²
The circumference of a circle with a diameter of 20 centimeters is: 62.83 cm (diameter x Pi = circumference).