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anonymous

  • 5 years ago

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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  1. anonymous
    • 5 years ago
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    |dw:1326924368144:dw|

  2. anonymous
    • 5 years ago
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    A=Pi * r^2

  3. anonymous
    • 5 years ago
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    the picture wasnt given by the way... i drew it myself

  4. phi
    • 5 years ago
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    |dw:1326924766289:dw|

  5. phi
    • 5 years ago
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    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?

  6. anonymous
    • 5 years ago
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    continue please

  7. Hero
    • 5 years ago
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    Yes, this is not as hard as you think.

  8. anonymous
    • 5 years ago
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    yeah, i know. i dont seem to be getting the right answer though.

  9. Hero
    • 5 years ago
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    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.

  10. anonymous
    • 5 years ago
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    ok i made one mistake

  11. anonymous
    • 5 years ago
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    let me retype the question

  12. anonymous
    • 5 years ago
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    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.)

  13. Hero
    • 5 years ago
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    Which circular ring is 90? The big one or little one?

  14. anonymous
    • 5 years ago
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    the prob doesnt say but i am assuming its the while circle (little one included)

  15. anonymous
    • 5 years ago
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    |dw:1326927820335:dw|

  16. anonymous
    • 5 years ago
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    all of that is 90

  17. anonymous
    • 5 years ago
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    i think

  18. anonymous
    • 5 years ago
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    *whole circle

  19. Hero
    • 5 years ago
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    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

  20. Hero
    • 5 years ago
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    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

  21. anonymous
    • 5 years ago
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    i know

  22. anonymous
    • 5 years ago
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    thats why im confusded.

  23. anonymous
    • 5 years ago
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    *confused

  24. anonymous
    • 5 years ago
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    but thats the problem.

  25. Hero
    • 5 years ago
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    Well, if it's that bad, don't do the problem.

  26. Hero
    • 5 years ago
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    It's clearly ambiguous

  27. Hero
    • 5 years ago
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    Is this problem on your computer or in your book?

  28. anonymous
    • 5 years ago
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    hw site

  29. anonymous
    • 5 years ago
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    try this link

  30. Hero
    • 5 years ago
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    Nope didn't work. Why do you go to the site and copy screen and save as picture file, then upload here.

  31. anonymous
    • 5 years ago
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    how do i do that?

  32. Hero
    • 5 years ago
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    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

  33. anonymous
    • 5 years ago
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    hold on. im gonna use excel 2010.

  34. Hero
    • 5 years ago
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    Excel? What's that gonna do?

  35. anonymous
    • 5 years ago
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    1 Attachment
  36. anonymous
    • 5 years ago
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    does it work?

  37. anonymous
    • 5 years ago
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    excel has a screenshot option

  38. Hero
    • 5 years ago
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    Okay, I understand now.

  39. Hero
    • 5 years ago
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    Hold on a sec.

  40. Hero
    • 5 years ago
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    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.

  41. anonymous
    • 5 years ago
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    show me how u got that please

  42. Hero
    • 5 years ago
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    vyew?

  43. anonymous
    • 5 years ago
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    huh?

  44. Hero
    • 5 years ago
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    Funny, everyone knows what twiddla is, but no one knows what vyew is

  45. anonymous
    • 5 years ago
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    idk either lol

  46. Hero
    • 5 years ago
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    http://vyew.com/room#/418625/Open_Study

  47. Hero
    • 5 years ago
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    Mario, where are you?

  48. anonymous
    • 5 years ago
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    Hero I need help putting in a prob into my hw site... its the latest one i posted

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