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Multiply the diameter by 3.1415
NO - ignore that! Diameter x pi (3.1416) is the circumference, the distance around a circle.
Square footage is area, so the correct formula is Area = 3.1416 times radius squared. The radius would be measured in feet.
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∙ 12y ago
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What is the square footage of a 20'-9 circle?
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What is the square footage of 20 ft circle?
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