The outer radius is 20/2 = 10 inches
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The radius would be 10 inches. Not sure about a radious, though.
If that is the diameter, divide by 2 to get the radius. Then use the formula: area = pi x radius2.
Diameter = 20 inch => radius = 10 inches = 10/12 feet. So area = pi*(10/12)^2 = 2.1817 sq feet approx.
Twice pi multiplied by the radius will get you the result. Pi, if you are going to round to the inch, call it 3.14. The radius will be half the diameter...20 inches. Find a calculator and multiply 2 X 3.14 X 20...you can do it. You can also multiply pi times the diameter and get the same result.
20; the diameter of a circle is twice its radius.