Question

find length of arc JL
http://www.usatestprep.com/modules/gallery/files/14/1413/1413.gif

Answer 1

Arc length = 2*pi*r* (angle of arc/360)

Here, r = 2, pi is a constant and we will use 3.14 to represent it. Angle of arc = 125. Now we plug the numbers in and solve.

Arc length = 2*3.14*2*(125/360)
= 12.56 * (125 / 360)
= 4.361

The arc length is just a portion of the circumference. So all we do to find its length is we first find the circumference of the circle, and then multiply that by the angle subtended by the arc. If you think about that, it will all make sense to you.

Answer 2

a) 25/9pi
b) 5/13pi
c) 25/18pi
d) 14/17pi

which one?

Answer 3

c) 25/18pi @shannimal