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Question

The diameter of a tire is 2.5 ft. Use this measurement to answer parts a and b. Show all work to receive full credit.

Find the circumference of the tire.
About how many times will the tire have to rotate to travel 1 mile? (1 mile = 5,280 ft)

Answer 1

a) Circumference = 2πr
= 2π(2.5 ft)
= 5π ft

b) Circumference of tire = 5π ft
Distance traveled in 1 rotation = 5π ft
Number of rotations to travel 1 mile = 5,280 ft / 5π ft
= 1056/π rotations
≈ 333.5 rotations

Answer 2

AAAaannndd the bot gets it wrong yet again!

C=πd
so cut the circumference by half, and double the rotations needed.