Consider circle h with a 3 centimeter radius. if the length of minor arc rt is 2 3 π, what is the measure of ∠rst? a) 20° b) 30° c) 40° d) 60°

If the arc is ⅔π, then your angle will be none of these. The central angle (if s is the center I presume) would be 120, since π is 180 and ⅔ of 180 is 120. The only time you would get one of those choices is if the angle went not to the center but straight across to the other side, in that case it would be 60.