Using 3.14 as Pi the area of circle is: 78.5
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78.53981634 square units
Area of the circle is about 10 square units
Area of circle: pi*1.8^2 = about 10 square units
Radius = 20/2 = 10 Area of circle = pi x radius x radius = 3.1415 x 10 x 10 = 3.1415 x 100 = 314.15 square units
The area of a 10 foot circle is: 78.54 square units.