the circumference of roger's bike tire is 18 times pie inches. What is the

[cindezee]

radius, in inches, of the bike tire? A) 3
B) 9
C) 18
D) 36

 

[April]

C=2 pi r
18 pi = 2 pi r (divide each side by 2 pi)
r=9 in

 

[Oneballeddie]

B. radius is half the diameter.
Since C=PiD, D=18

 

[Oneballeddie]

B. radius is half the diameter.
Since C=PiD, D=18

 

[Randy P]

Circumference = 2*pi*r so r = circumference/2*pi