The area is 7.068 units2
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Area = pi * radius^2. radius = diameter / 2, so radius of this circle is 3.Area = 9 * pi (take your favorite value of pi: 3.1416....)
Circumference of circle: 20 × π = 62.832 feet rounded to 3 decimal places
Using 3.14 as Pi the area of circle is: 28.259999999999998
The circumference of a circle with an area of 3 acres is: 1,281 feet.
The area of a circle that has diameter of 3 cm is: 7.069 cm2