## 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

1. ineedhelponmyhw Group Title

|dw:1342158548525:dw|

2. ineedhelponmyhw Group Title

3. ineedhelponmyhw Group Title

...i just dont know how to solve it

4. Wired Group Title

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 Group Title

lol i was just going to ask if i could cross multiply

6. ineedhelponmyhw Group Title

omg thanks.

7. Wired Group Title

8. ineedhelponmyhw Group Title

lol

9. ineedhelponmyhw Group Title

and teachers says to NOT use wikipedia.

10. Wired Group Title

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 Group Title

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 Group Title

Why'd the teacher tell you the answer to a test question?

13. ineedhelponmyhw Group Title

so i could learn how to solve it.