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Alexandros Marinos · Answer 1 · 2019-08-01T04:07:32+0000

Since you are given the area, we can solve for radius with this equation:

$A_c = \pi r^2$

$r = \sqrt{ (A_c)/( \pi ) } = \sqrt{ (121 \pi )/( \pi ) } = √(121) = 11$

The radius is 11, so the diameter must be 2 times that, which is 22. With the correct units, the answer is 22 units²

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