anonymous
  • anonymous
The area of a circular ring is 90. If the radius is 10, what is the radius of the inner circle of the ring. (Assume the circles forming the ring have the same center.)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
|dw:1326924368144:dw|
anonymous
  • anonymous
A=Pi * r^2
anonymous
  • anonymous
the picture wasnt given by the way... i drew it myself

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More answers

phi
  • phi
|dw:1326924766289:dw|
phi
  • phi
the ring (dashed lines) has area 90. The big circle has area pi*10*10= 100 pi Subtract the ring from the big circle to get the area of the smaller circle. now you know A_small_circle= pi * r^2 so 100 pi - 90 = pi r^2 can you solve for r?
anonymous
  • anonymous
continue please
Hero
  • Hero
Yes, this is not as hard as you think.
anonymous
  • anonymous
yeah, i know. i dont seem to be getting the right answer though.
Hero
  • Hero
First of all, are you sure you wrote everything down correctly? You were not exactly clear in your original post. You need to state which area of which circle the 90 applies to. You also need to state which radius the 10 applies to.
anonymous
  • anonymous
ok i made one mistake
anonymous
  • anonymous
let me retype the question
anonymous
  • anonymous
The area of a circular ring is 90. If the radius of the outer circle forming the ring is 10, what is the radius of the inner circle of the ring? (Assume the circles forming the ring have the same center.)
Hero
  • Hero
Which circular ring is 90? The big one or little one?
anonymous
  • anonymous
the prob doesnt say but i am assuming its the while circle (little one included)
anonymous
  • anonymous
|dw:1326927820335:dw|
anonymous
  • anonymous
all of that is 90
anonymous
  • anonymous
i think
anonymous
  • anonymous
*whole circle
Hero
  • Hero
Why would they give you the area of the big one and then give you the radius of the big one. One of those are in conflict, and I'll prove it to you
Hero
  • Hero
A = pir^2 90 = pir^2 90/pi = r^2 sqrt(90/pi) = r see if you get r = 10 from that. I doubt it
anonymous
  • anonymous
i know
anonymous
  • anonymous
thats why im confusded.
anonymous
  • anonymous
*confused
anonymous
  • anonymous
but thats the problem.
Hero
  • Hero
Well, if it's that bad, don't do the problem.
Hero
  • Hero
It's clearly ambiguous
Hero
  • Hero
Is this problem on your computer or in your book?
anonymous
  • anonymous
hw site
anonymous
  • anonymous
https://www.mathclass.org/mc/hw.aspx?WhsAcctId=a10614d4-5e55-4afb-a76f-ee3001ef3e66&classId=2161&hwId=6221&rndSeed=32456754&mode=0&noSVG=0
anonymous
  • anonymous
try this link
Hero
  • Hero
Nope didn't work. Why do you go to the site and copy screen and save as picture file, then upload here.
anonymous
  • anonymous
how do i do that?
Hero
  • Hero
I just told you. There should be a "print screen" function on your keyboard. Go to the site and press that. Alternatively find a copy screen program online
anonymous
  • anonymous
hold on. im gonna use excel 2010.
Hero
  • Hero
Excel? What's that gonna do?
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
does it work?
anonymous
  • anonymous
excel has a screenshot option
Hero
  • Hero
Okay, I understand now.
Hero
  • Hero
Hold on a sec.
Hero
  • Hero
r = 8.45 The problem it didn't say whether to use 3.14 for pi or not. By the way, you imagined the area incorrectly initally.
anonymous
  • anonymous
show me how u got that please
Hero
  • Hero
vyew?
anonymous
  • anonymous
huh?
Hero
  • Hero
Funny, everyone knows what twiddla is, but no one knows what vyew is
anonymous
  • anonymous
idk either lol
Hero
  • Hero
http://vyew.com/room#/418625/Open_Study
Hero
  • Hero
Mario, where are you?
anonymous
  • anonymous
Hero I need help putting in a prob into my hw site... its the latest one i posted

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