How can you calculate the circumference if you know the circle's radius?

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asked Sep 9, 2018 71.1k views

2 Answers

Aphoe · Answer 1 · 2018-09-12T15:31:17+0000

Set up the formula for the area of a circle.
The formula is A = πr^2 {A=\pi r^{2}} , where A equals the area of the circle, and r equals the radius.Solve for the radius. ...
Plug the area into the formula. ...
Divide the area by . ...
Take the square root.

How can you calculate the circumference if you know the circle's radius?

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