A bike wheel has a radius of 13 inches....

Question

A bike wheel has a radius of 13 inches.

1. About how far does the bike wheel travel in 1 rotation? 

5 rotations? 

30 rotations?

Answer 1

circumference = pi x diameter = 2pir = 2pi(13) = 26pi = about 26(3.14) = about 81.7 inches = about 6.8 feet

in one rotation

for 5 rotations that's 5 x 26pi = 130pi = about 34 feet

for 30 rotations that's 30 x 26pi = 780pi = about 204.2 feet

30 rotations gives 6 times 5 rotations, about 34x5 = 204 feet