Help me with this math problem please!

Answer:
NO = 5
Step-by-step explanation:
NO = radius
[tex]\frac{5}{3} \pi =\frac{\pi (60)(NO)}{180}[/tex]
[tex]\pi (60)NO=\frac{5}{3} \pi (180)[/tex]
[tex]NO=\frac{\frac{5}{3}\pi (180) }{60\pi } =\frac{900}{180} =5[/tex]
Hope this helps