Respuesta :

Answer:

C- 66

Step-by-step explanation:

Multiply the radius (10.5) by 2 and then times that (10.5x2=21) by pi (3.14)

Answer:

C=66

Step-by-step explanation:

C=2pi*r

C=2*pi*10.5

C=21*pi

C=21*3.14

C=65.94