It is: 4*pi*11.5squared = 529*pi square feet
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Area = 415.48 ft2
A circle with a 23 inch diameter has am area of 415.4756 sq inches (to 4 dp).
A circle with a radius of 11.5 miles has an area of 415.48 square miles.
Area = pi*11.52 = 415.476 square units rounded to 3 decimal places
Entire surface area: (2*pi*121)+(22*pi*23) = = 748*pi square inches