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ineedhelponmyhw

  • 2 years ago

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

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  1. ineedhelponmyhw
    • 2 years ago
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    |dw:1342158548525:dw|

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

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

  4. Wired
    • 2 years ago
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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!)

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

  6. ineedhelponmyhw
    • 2 years ago
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    omg thanks.

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

  8. ineedhelponmyhw
    • 2 years ago
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    lol

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

  10. Wired
    • 2 years ago
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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!

  11. ineedhelponmyhw
    • 2 years ago
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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.

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

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

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