anonymous
  • anonymous
if arc AB measures 155 degrees (14 cm), what is the length of the radius of the circle, to the nearest hundredth? drawing.........
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
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anonymous
  • anonymous
my teacher says the answer is 5.71 (the radius)
anonymous
  • anonymous
...i just dont know how to solve it

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anonymous
  • anonymous
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!)
anonymous
  • anonymous
lol i was just going to ask if i could cross multiply
anonymous
  • anonymous
omg thanks.
anonymous
  • anonymous
No problemo. Google FTW :)
anonymous
  • anonymous
lol
anonymous
  • anonymous
and teachers says to NOT use wikipedia.
anonymous
  • anonymous
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!
anonymous
  • anonymous
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.
anonymous
  • anonymous
Why'd the teacher tell you the answer to a test question?
anonymous
  • anonymous
so i could learn how to solve it.

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