Area of a circle = pi*radius squared
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Area = pi*72 = 153.938 square meters
Using 3.14 as Pi the area of circle is: 153.86
A circle with a radius of 30 meters has an area of 2827.43 square meters.
A circle with an area of 2.0 square meters has a diameter of : 1.596 meters.
The area of a 12-meter circle is 113.1 square meters.