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anonymous

  • one year ago

A bicycle wheel with radius 26" rotates through an arc that measures 80°. What is the length of the arc of the tire that touched the ground? a) 2.88pi inches b) 5.78pi inches c) 11.56pi inches

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  1. anonymous
    • one year ago
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    I tried to divide 80 by 26 and then multiplying that answer by 180, but it didn't work out so well...

  2. anonymous
    • one year ago
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    now we have to convert 80 degree to radians

  3. anonymous
    • one year ago
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    Divide it by pi

  4. anonymous
    • one year ago
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    ?

  5. anonymous
    • one year ago
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    no this time we are converting the other way \[80\times \frac{\pi}{180}\]

  6. anonymous
    • one year ago
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    1.395?

  7. anonymous
    • one year ago
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    that comes out to be \[\frac{4\pi}{9}\] radians

  8. anonymous
    • one year ago
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    oh

  9. anonymous
    • one year ago
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    0.4pi

  10. anonymous
    • one year ago
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    yeah about that we are still not done though

  11. anonymous
    • one year ago
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    Do we multiply that by 180?

  12. anonymous
    • one year ago
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    no now we think, maybe draw a picture

  13. anonymous
    • one year ago
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    |dw:1436971051817:dw|

  14. anonymous
    • one year ago
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    we want \(a\) the arc length the radian measure is arc length over the radius so \[\frac{a}{26}=.4\pi=1.4\] so \[a=26\times 1.4\]

  15. anonymous
    • one year ago
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    http://www.wolframalpha.com/input/?i=26*1.4 you got a choice that is close to 36.4?

  16. anonymous
    • one year ago
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    oh wait, i see all your answers have \(\pi\) in them

  17. anonymous
    • one year ago
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    \[a=26\times \frac{9}{4}\pi=11.5\pi\]

  18. anonymous
    • one year ago
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    Wow that makes alot more sense than it did before

  19. anonymous
    • one year ago
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    yeah sorry i messed up earlier

  20. anonymous
    • one year ago
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    Umm. There's another question. I have already answered it, but I want to make sure I'm doing this the right way

  21. anonymous
    • one year ago
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    kk

  22. anonymous
    • one year ago
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    If the length of an arc is 12pi inches and the radius of the circle is 10 inches, what is the measure of the arc? a) 216 degrees b) 270 degrees c) 288 degrees

  23. anonymous
    • one year ago
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    I chose A

  24. anonymous
    • one year ago
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    Is that correct?

  25. anonymous
    • one year ago
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    let me check

  26. anonymous
    • one year ago
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    the radian measure is \[\frac{12\pi}{10}=1.2\pi\]

  27. anonymous
    • one year ago
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    then \[1.2\pi\times \frac{180}{\pi}=1.2\times 180=216\]

  28. anonymous
    • one year ago
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    yeah you got it !

  29. anonymous
    • one year ago
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    Thanks

  30. anonymous
    • one year ago
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    yw now i am listening to your your tube

  31. anonymous
    • one year ago
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    I feel pretty good now. Finally! Lol!

  32. anonymous
    • one year ago
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    Take your time.

  33. anonymous
    • one year ago
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    what should i be looking for ?>

  34. anonymous
    • one year ago
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    Me dropping my music and then picking it up on the left side of the screen somewhere in the middle of the song

  35. anonymous
    • one year ago
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    Lol!

  36. anonymous
    • one year ago
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    I should be the last person on the row of trumpets. On the outside since I'm leader

  37. anonymous
    • one year ago
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    i will look again right or left side?

  38. anonymous
    • one year ago
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    Left

  39. anonymous
    • one year ago
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    You should see white paper

  40. anonymous
    • one year ago
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    on the floor and me picking it up

  41. anonymous
    • one year ago
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    ok looking now

  42. anonymous
    • one year ago
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    You see it. I mean me Lol!

  43. anonymous
    • one year ago
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    lol yeah

  44. anonymous
    • one year ago
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    you are hidden mostly but i did see you pick up the sheet!

  45. anonymous
    • one year ago
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    Yeah It's a little embarrassing

  46. anonymous
    • one year ago
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    you got more math questions are are you ok? i gotta run soon

  47. anonymous
    • one year ago
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    Oh sorry

  48. anonymous
    • one year ago
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    I had to grab something to eat

  49. anonymous
    • one year ago
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    eating is good you got any more before i run?

  50. anonymous
    • one year ago
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    Yeah

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