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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.
cir. of a circle is equals to pi xd. hence,d=23/pi. Taking pi to be 3.142, d=7.32(3s.f)
The circumference of a circle that has a diameter of 23' 11" is 901.64 inches.