# cirlces and detrmineing the length

• June 2nd 2010, 12:15 PM
allsmiles
cirlces and detrmineing the length
Ok, can someone help me out here? kinda stuck

http://www.usatestprep.com/images/audio_icon_small2.gif Determine the length of arc JL.
A)
59
12
π
B)
5
6
π
C)
13
12
π
D)
13
6
π
• June 2nd 2010, 12:30 PM
e^(i*pi)
Quote:

Originally Posted by allsmiles
Ok, can someone help me out here? kinda stuck

http://www.usatestprep.com/images/audio_icon_small2.gif Determine the length of arc JL.
A)
59
12
π
B)
5
6
π
C)
13
12
π
D)
13
6
π

For degrees the arc length x can be found by $\frac{x}{2\pi r} = \frac{\theta}{360}$

Where x is arc length, $r$ is the radius and $\theta$ the angle subtended

Incidentally it's much easier in radians because $x = r \theta$