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ineedhelponmyhw Group Title

if arc AB measures 155 degrees (14 cm), what is the length of the radius of the circle, to the nearest hundredth? drawing.........

  • 2 years ago
  • 2 years ago

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  1. ineedhelponmyhw Group Title
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    |dw:1342158548525:dw|

    • 2 years ago
  2. ineedhelponmyhw Group Title
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    my teacher says the answer is 5.71 (the radius)

    • 2 years ago
  3. ineedhelponmyhw Group Title
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    ...i just dont know how to solve it

    • 2 years ago
  4. Wired Group Title
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    http://en.wikipedia.org/wiki/Arc_(geometry) \[\frac{arc degree}{360}=\frac{arclength}{circumference}\] http://en.wikipedia.org/wiki/Arc_(geometry) \[\frac{arc degree}{360}=\frac{arclength}{circumference}\] \[\frac{155}{360}=\frac{14}{2\pi*r}\] Using cross multiplication: \[155*2\pi*r=14*360\] Solve for r. Note: I got 5.17, so someone wrote it down wrong (either you or the teacher!)

    • 2 years ago
  5. ineedhelponmyhw Group Title
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    lol i was just going to ask if i could cross multiply

    • 2 years ago
  6. ineedhelponmyhw Group Title
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    omg thanks.

    • 2 years ago
  7. Wired Group Title
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    No problemo. Google FTW :)

    • 2 years ago
  8. ineedhelponmyhw Group Title
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    lol

    • 2 years ago
  9. ineedhelponmyhw Group Title
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    and teachers says to NOT use wikipedia.

    • 2 years ago
  10. Wired Group Title
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    Probably because it's not a truly vetted source. It is better to use your book to find the equation. If you google something (e.g. arc length) and find multiple pages on the net have the same equation, then you're probably good. Having said that your book is always your best source!

    • 2 years ago
  11. ineedhelponmyhw Group Title
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    i dont have a book, i have online schooling and its a test so i cant go back to look at how to solve it.

    • 2 years ago
  12. Wired Group Title
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    Why'd the teacher tell you the answer to a test question?

    • 2 years ago
  13. ineedhelponmyhw Group Title
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    so i could learn how to solve it.

    • 2 years ago
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