In a circle with a radius of 9 yards and arc is intercepted by central angle of pi radians over 6 radians what is the arc length used 3.4 for pi radius

We know that
[length of a circumference]=2*pi*r
for r=9 yd
[length of a circumference]=2*pi*9> 56.52 yd

if 2*pi radians (full circle)> has a length of 56.52 yd
 pi/6 radians> X
X=(pi/6)*56.52/(2*pi)> X=4.71 yd

the answer is
the arc length is 4.71 yd