A circle with a radius of 23 units has an area of 1,661.9 square units.
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Circle area = (Pai) r 2 where r is the radius. Area = 3.14 x 23 x 23 = 1661.06
A circle with a radius of 11.5 miles has an area of 415.48 square miles.
Area of circle = pi x r x r where r is the radius. You do not specify if 23 inch is the diameter or radius of the circle. Anyway pi = 3.1415 so plug in the value of the radius in the formula above and you will get the area in square inches. Then divide that by 144 to get area in square feet.
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared