0.76 sq ft.
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The surface area of a sphere with a 24 inch diameter is 1809.6 square inches = 12.6 sq feet
13.6354 square feet (rounded)
Area of circle: pi*2.75 squared = 23.758 square feet to three decimal places
There are 100*pi square inches in a 20 inch diameter circle
2.78 square feet.