area of a circle is pi times the radius squared. If you simplify pi to 3.14, then the area is about 18.0864 square meters. For a more accurate calculation, use a calculator that has a pi button, and multiply it by 5.76.
For reference sake, pi looks somewhat like this:
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A = 45.8 m2
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared
The area of a circle of radius 21 is 1386
A circle with a radius of 135 units has an area of 57,255.53 square units.