Find the arc length (Give an exact answer and show work)

Answer:
Step-by-step explanation:
arc length formula s = r \Ф
s = 6 * [tex]\frac{7\pi }{4}[/tex]
s = [tex]\frac{42\pi }{4}[/tex]
s = [tex]\frac{21\pi }{2}[/tex]
leave it like that , above, b/c that's an exact answer.