Find the length of arc AC if AB is 12ft and has a degree of 60

S = r theta

Where s = arc length

R = radius

Theta = angle measure in radians.

If AB is the radius

S = 12 * 60 (pi/180)

S = 12 * pi/3

S = 4pi ft

S = 12.56 ft

If AB is the diameter

S = 6 * 60 (pi/180)

S = 6 * pi/3

S = 2pi ft

S = 6.28 ft

The (pi/180) is the conversion factor from degrees to radians.