Why is the circumference formula more accurate than actually measuring around the circle?

Step-by-step explanation:

Measuring with some ruler that can bend is not accurate because it could be off by 0.000000001 mm or something, calculation is more precise like 3.14...

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles