A central angle of a circle whose radius is 8 centimeters subtends an arc whose length is 2π9centimeters.
What is the radian measure of the central angle?
2pi/9 = r (theta in rads)
2pi /9 = 8 (theta in rads) divide both sides by 8
(1/8) * 2pi / 9 = 2pi / 72 = theta in rads = pi / 36