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

Mathematics
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my teacher says the answer is 5.71 (the radius)
...i just dont know how to solve it

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Other answers:

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

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