Area of the circle: pi*22 = 12.566 square feet to three decimal places
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A circle with a radius of 2 feet has an area of 12.57 square feet.
Using 3.14 as Pi the area of circle is: 1384.74
Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared
A circle with a radius of 75 feet has an area of 17671.458676442588 square feet. You calculate this by using the area of a circle formula, which is A=pi*r^2.
A circle with a radius of 12.5 feet (25/2) has an area of 490.87 square feet.