PiR2
(Pi) x (radius) squared
3.14 x (55/2) squared
(3.14 x 27.5) x (3.14 x 27.5) = 7456.32 sq. ft.
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A 48-inch diameter circle has an area of: 12.57 square feet.
804.2496
176.625
346
The formula for the area of a circle is pi (3.141265...) times the radius squared. Since half of the diameter is the radius, plug that number into the formula to get the total square feet.