A central angle of 60degrees subtends an arc of 18pi inches. Find the radius of the circle.
do you use this: S=2*pi*r?
If so, how do you use it? I know that when r = 1, the central angle = the arc. However, you need to find the radius in this problem. So what do I do?
"A central angle of 60degrees subtends an arc of 18pi inches. Find the radius of the circle. do you use this: S=2*pi*r? If so, how do you use it? I know that when r = 1, the central angle = the arc. However, you need to find the radius in this problem. So what do I do?"
theta = 60 degrees = pi/3
S = 18 pi
if S = r(theta)
r = S/theta = (18 pi)/(pi/3) =18(3) =