62.83 ft2
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The area of a circle with a diameter of 8 feet is: 50.27 square feet.
A circle with a diameter of 6 feet has an area of 28.27 square feet.
A circle that has an area of 78.5 square feet has a diameter of 10 feet.
The surface area of a sphere with a diameter of 18 feet is: 1,020 square feet.
The area is 50.27 square feet.