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ineedhelponmyhw

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

  • one year ago
  • one year ago

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  1. ineedhelponmyhw
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    |dw:1342158548525:dw|

    • one year ago
  2. ineedhelponmyhw
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    my teacher says the answer is 5.71 (the radius)

    • one year ago
  3. ineedhelponmyhw
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    ...i just dont know how to solve it

    • one year ago
  4. Wired
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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!)

    • one year ago
  5. ineedhelponmyhw
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    lol i was just going to ask if i could cross multiply

    • one year ago
  6. ineedhelponmyhw
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    omg thanks.

    • one year ago
  7. Wired
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    No problemo. Google FTW :)

    • one year ago
  8. ineedhelponmyhw
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    lol

    • one year ago
  9. ineedhelponmyhw
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    and teachers says to NOT use wikipedia.

    • one year ago
  10. Wired
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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!

    • one year ago
  11. ineedhelponmyhw
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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.

    • one year ago
  12. Wired
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    Why'd the teacher tell you the answer to a test question?

    • one year ago
  13. ineedhelponmyhw
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    so i could learn how to solve it.

    • one year ago
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