Respuesta :

wegnerkolmp2741o

Answer:

9 cm

Step-by-step explanation:

Circumference of a circle is given by

C = pi * 2 *r

18 pi = pi * 2 *r

Divide each side by pi

18 = 2 r

Divide each side by 2

18/2 = 2r/2

9 = r

The radius is 9 cm