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gabbyalicorn

  • one year ago

The diameter of the larger circle is 20.4 cm. The diameter of the smaller circle is 10.8 cm. What is the approximate area of the shaded region? A. 326.7 cm² B. 289.4 cm² C. 235.1 cm² D. 72.3 cm²

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  1. gabbyalicorn
    • one year ago
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    https://www.dropbox.com/s/nu37d4qt54hihf3/Screenshot%202015-06-09%2014.32.43.png?dl=0

  2. anonymous
    • one year ago
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    \[Area~of~larger~circle-Area~of~smaller~circle\]

  3. anonymous
    • one year ago
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    find the area of both circles, then subtract the small circle form the big one

  4. gabbyalicorn
    • one year ago
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    oh i kinda maybe sorta get this 1 so 20.4 x 3.14 10.8 x 3.14 then u sutract the 2

  5. anonymous
    • one year ago
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    Do you remember the area of a circle formula? We've gone over it twice now

  6. gabbyalicorn
    • one year ago
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    64.056 - 33.912 and yes A= π x r ^2

  7. anonymous
    • one year ago
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    And you know that \[\Large Radius=\large \frac{1}{2}Diameter\] right?

  8. gabbyalicorn
    • one year ago
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  9. anonymous
    • one year ago
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    \[\sqrt{?}\]

  10. gabbyalicorn
    • one year ago
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    right!

  11. gabbyalicorn
    • one year ago
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    √ = radius= 1/2 diameter

  12. anonymous
    • one year ago
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    \[\sqrt{}=\color{aqua}r\color{red}a\color{blue}d\color{green}i\color{yellow}u\color{brown}s?\]

  13. gabbyalicorn
    • one year ago
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    long story short i was saying right but witch a check mark ^u^

  14. anonymous
    • one year ago
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    Oh. I was wondering what sqrt's had to do with it.

  15. gabbyalicorn
    • one year ago
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    sorry, for the confusion

  16. anonymous
    • one year ago
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    Anyways, the questions give us the diameters. We have to halve those to get the radius so that we can plug into the area of a circle equation.

  17. anonymous
    • one year ago
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    \[(\pi*\frac{20.4}{2}^{2})-(\pi*\frac{10.8}{2}^{2})\] is our overall equation for this problem.

  18. anonymous
    • one year ago
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    Divide before squaring though

  19. gabbyalicorn
    • one year ago
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    653.3712 - 183.1248 = 470.2469

  20. gabbyalicorn
    • one year ago
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    ?

  21. anonymous
    • one year ago
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    Divide BEFORE squaring. 20.4/2 = 10.2. 10.2^2=?

  22. gabbyalicorn
    • one year ago
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    aww man

  23. gabbyalicorn
    • one year ago
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    104.04

  24. anonymous
    • one year ago
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    104.04*pi=?

  25. gabbyalicorn
    • one year ago
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    326.6856

  26. anonymous
    • one year ago
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    Now repeat the process for 10.8

  27. gabbyalicorn
    • one year ago
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    366.2496

  28. anonymous
    • one year ago
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    10.8/2=?

  29. gabbyalicorn
    • one year ago
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    oh 5.4

  30. anonymous
    • one year ago
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    5.4^2=?

  31. gabbyalicorn
    • one year ago
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    29.16

  32. anonymous
    • one year ago
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    29.16*pi=?

  33. gabbyalicorn
    • one year ago
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    91.5624

  34. anonymous
    • one year ago
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    now subtract

  35. gabbyalicorn
    • one year ago
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    so 91.5624 - 29.16 = 62.4024

  36. gabbyalicorn
    • one year ago
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    waot no!!!

  37. anonymous
    • one year ago
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    Come on man. Look at my very first reply in the thread

  38. gabbyalicorn
    • one year ago
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    I was wrong sorry

  39. gabbyalicorn
    • one year ago
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    91.5624 -366.2496

  40. anonymous
    • one year ago
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    326-91 bruh

  41. gabbyalicorn
    • one year ago
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    oh :/ sorry. 235 C

  42. anonymous
    • one year ago
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    yeah that'd be it

  43. gabbyalicorn
    • one year ago
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    Thank you!

  44. anonymous
    • one year ago
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    No problem :)

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