Using 3.14 as Pi the area of circle is: 153.86
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Area = pi*72 = 153.938 square meters
The area of a circle that has a diameter of 14 inches is: 153.9 square inches.
Diameter = 28 m => radius = 28/2 m = 14 metres. Then, area = pi*r2 = 615.75 sq metres.
Area of a circle = pi*radius squared
The diameter is 4.222 feet.