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.)

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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
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|dw:1326924368144:dw|
A=Pi * r^2
the picture wasnt given by the way... i drew it myself

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Other answers:

  • phi
|dw:1326924766289:dw|
  • 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?
continue please
Yes, this is not as hard as you think.
yeah, i know. i dont seem to be getting the right answer though.
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.
ok i made one mistake
let me retype the question
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.)
Which circular ring is 90? The big one or little one?
the prob doesnt say but i am assuming its the while circle (little one included)
|dw:1326927820335:dw|
all of that is 90
i think
*whole circle
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
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
i know
thats why im confusded.
*confused
but thats the problem.
Well, if it's that bad, don't do the problem.
It's clearly ambiguous
Is this problem on your computer or in your book?
hw site
https://www.mathclass.org/mc/hw.aspx?WhsAcctId=a10614d4-5e55-4afb-a76f-ee3001ef3e66&classId=2161&hwId=6221&rndSeed=32456754&mode=0&noSVG=0
try this link
Nope didn't work. Why do you go to the site and copy screen and save as picture file, then upload here.
how do i do that?
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
hold on. im gonna use excel 2010.
Excel? What's that gonna do?
1 Attachment
does it work?
excel has a screenshot option
Okay, I understand now.
Hold on a sec.
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.
show me how u got that please
vyew?
huh?
Funny, everyone knows what twiddla is, but no one knows what vyew is
idk either lol
http://vyew.com/room#/418625/Open_Study
Mario, where are you?
Hero I need help putting in a prob into my hw site... its the latest one i posted

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