The area of a circle is equal to pi times r2. If D is 14 miles, then r is 7 miles. Pi is approximately 3.14 and 72 is 49. So 3.14 x 49 = 153.86 square miles.
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Circumference: 14*pi mi Area: 49*pi square mi
A circle with a radius of 11.5 miles has an area of 415.48 square miles.
10 mi. = 16.0934 km
22.52 x pi = 506.25pi sq miles. Taking pi as 355/113 gives 1590.43 sq mi
1.24 mi. 1 mi equals 5280 ft 6561/5280 = 1.2426 mi.