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.
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A circle with a 23 inch diameter has am area of 415.4756 sq inches (to 4 dp).
The square footage, or area, of a 14' x 23' rectangle would be 322' squared.
299 square feet = 33.22 square yards
A circle with a radius of 23 units has an area of 1,661.9 square units.
667 square feet. Just multiply length by width - the answer is the square footage.