The circumference of a circle with radius [tex]r[/tex] is
[tex]C=2\pi r[/tex]
So, one quarter of a circumference will be
[tex]\dfrac{C}{4}=\dfrac{\pi r}{2}[/tex]
You radius is 6, so we have
[tex]\dfrac{C}{4}=\dfrac{6\pi}{2}=3\pi \approx 9.42[/tex]
