anonymous
  • anonymous
how do you find the radius of a circle if you know the area?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
pi times the radius squared euals area so do that backwards
precal
  • precal
use\[ A=\pi (r^{2})\]
anonymous
  • anonymous
so if area =1cm2 and pi = 3.14 then radius = .5?

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anonymous
  • anonymous
\[R= \sqrt{A/\pi}\]
precal
  • precal
were you told to use 3.14 as pi?
anonymous
  • anonymous
yes
precal
  • precal
then you can use 3.14 otherwise pi is pi
anonymous
  • anonymous
okay, thanks
precal
  • precal
anytime :)
anonymous
  • anonymous
area = 50.24 pi= 3.14 so radius would equal 8?

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