Question

if a circle has a radius of 3 in. and a 120 degree arc, what is the arc length?

Answer 1

Use the formula x = a / r, where x is the angle (in radians), a is the arc length, and r is the radius of the circle. (Pay particular attention to x, since this formula only applies when x is measured in radians.)

Answer 2

120
--- * 2 pi r
360

120
--- * 2 pi 3
360

2 pi or 6.28