How many times does a tire with a diameter of 30 in. rotate when it travels a mile?
**Tip: As there are 63,360 in. in each mile, 63,360 divided by circumference = number of full rotations. Round up to the next whole number.
*
673 rotations
90 rotations
1345 rotations
336 rotations
336 rotations
To find the circumference of the tire, we use the formula C = πd (circumference = π x diameter).
C = π(30) = 30π ≈ 94.25 in.
Next, we divide the total distance in inches in a mile by the circumference in inches.
63,360 in / 94.25 in ≈ 673 rotations
Rounding up to the next whole number, the tire would rotate 336 times to travel a mile.