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Jvatic · Answer 1 · 2022-01-14T08:29:11+0000

Answer:
$21 = 2\pi r$

Explanation:

To find the circumference of a circle, you can use
$2\pi r$ . You can set this equal to 21 (feet). The equation to solve at this point would be
$21=2\pi r$ .

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