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The area of a circle is (pi) times (radius)2 .

There's a (pi) key on your calculator. It's 3.1416 rounded, or (22/7).

If the diameter is 2-ft, the radius is 1-ft, and the (radius)2 is 1-ft2 .

Area of the circle = (pi) x (radius)2 = (pi) x (1) = 3.1416 square feet.

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Q: How do you figure square feet in a 2 foot diameter circle?
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