We need to find the radius of the circle....so we have that
8 pi = 2pi * r divide both sides by 2pi
4 cm = r
(1/3) of the area of this triangle can be found as :
(1/2) r^2 sin (120° ) =
(1/2) 4^2 * √3/2 =
4√3 cm^2
So....3 times this is just
12√3 cm^2 ≈ 20.78 cm^2
