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Sebastian Hoitz · Answer 1 · 2016-12-22T21:10:44+0000

The area of any circle is equal to
$\pi r^2$ , where r is the radius.

We know that the diameter is 12. The radius is always half of the diameter, so the radius of our circle must be 6.

Substitute 6 for r in our equation and simplify.

π6² = π6×6 = 36π in²

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