## anonymous 4 years ago how do you find the radius of a circle if you know the area?

1. anonymous

pi times the radius squared euals area so do that backwards

2. precal

use$A=\pi (r^{2})$

3. anonymous

so if area =1cm2 and pi = 3.14 then radius = .5?

4. anonymous

$R= \sqrt{A/\pi}$

5. precal

were you told to use 3.14 as pi?

6. anonymous

yes

7. precal

then you can use 3.14 otherwise pi is pi

8. anonymous

okay, thanks

9. precal

anytime :)

10. anonymous

area = 50.24 pi= 3.14 so radius would equal 8?