anonymous
  • anonymous
I need the area of circle that is 2" in with the DIA of the disk is 8.5"
Mathematics
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anonymous
  • anonymous
I need the area of circle that is 2" in with the DIA of the disk is 8.5"
Mathematics
schrodinger
  • schrodinger
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amistre64
  • amistre64
what??
anonymous
  • anonymous
I have a disk at is 8.5 inches in Dia. there is 2 inches of this disk I am trying to figure out the area.
amistre64
  • amistre64
so if we had a circle and you chopped off an end of it, how much area would it be? like this?
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anonymous
  • anonymous
The 2 inches is the dia too (a complete circle) not a segment.
amistre64
  • amistre64
like this then? maybe?
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anonymous
  • anonymous
yes something like that. I know the raduis is 4.25
anonymous
  • anonymous
let say the white part is the 2 "
amistre64
  • amistre64
ohhh...ok
amistre64
  • amistre64
diam/2 = 8.5/2 = 4.25 the area of the whole thing then is: (4.25)^2pi now remove the area of the inner circle which has the radius of 2.25 (4.25)^2 pi - (2.25)^2 pi = pi( 4.25^2 - 2.25^2)
amistre64
  • amistre64
13pi is what I come up with
amistre64
  • amistre64
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anonymous
  • anonymous
Where does the 2.25 come from?
anonymous
  • anonymous
Thanks I think I figured it out!
amistre64
  • amistre64
:) I knew you could do it :)

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