Circle d has a radius of 21 millimeters and central angle, ∠edf, which measures 60°. find the exact length of. mm 7mm 14mm 42mm

The length of an arc length can be calculated using the formula:

s = ra

where s is the lenght of the arc

and r is the radius of the circle

a is the central angle in radians

first converts degrees to radians

a = 60 (pi / 180)

a = pi / 3 = 1.05

s = 21 (1.05)

s = 22 mm is the length of the arc