arc length .

Question

Answer 1

Raymond is correct. Just add the formula of changing Degrees to Radians in the first step:

D / 180 = Rad / pi

120 / 180 = Rad / pi Cross multiply and reduce:

Rad = 120 pi / 180 = 2 pi / 3

Answer 2

arc length = radius times radians

angle = 360-240 = 120 = 2pi/3

arc length = 9 times 2pi/3 = 6pi = about 18.85 yards

Area = pi(r)^2/3 = pi(9)^2/3 = 81 pi/3 = 27pi = about 254.5/3 = 84.8 square yards