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To find the diameter, you can use the area formula for a circle, and the fact that the diameter is the same as two radii:

A = pi*r2

d = 2r

The second equation is the same as d/2 = r, so you can substitute that into the first equation, the solve for the diameter:

A = 3.14*(d/2)2

1231 = 3.14*(d/2)2

1231/3.14 = (d/2)2

square root(1231/3.14) = d/2

19.80 = d/2

39.60 = d

So, the diameter is approximately 39.6 feet.

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