posted by megan on .
To measure the length of a hiking trail, a worker uses a device with a 2-foot diameter wheel that counts the number of revolutions of wheel makes. If the device reads 1,100.5 revolutions at the end of the trail, how many miles long is the trail, to the nearest tenth of a mile?
circumfrence of circle is pi (3.14) times diameter
so 3.14 times 2 = 6.28
then 1100.5 times 6.28 is your answer. Remember to round to nearest tenth.
2 feet my 1100.5 revolutions =2201. feet divided by 5,280 feet per mile =.416856 of a mile or to the nearest 10th .4