Now, to get these answers you multiply the diameter by pi. In this case, our diameters were 250 and 328. Remember, the formula for pi is 22/7 or 3.14
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The small wheel has to turn more to travel the same distance as the larger wheel.
Circumference is diameter times Pi, you do the math.
Assuming what you're asking is for the circumference (distance around the entire wheel) the formula is r*2*pi. In this case the circumference is roughly 157 inches.
That completely depends on the size of the wheel ... the rear wheel on a farm tractor wouldn't turn as many times in 1 mile as the wheel on a skateboard would. If the tire on a car is 30 inches across, then it turns 672 revolutions (rounded number) in one mile.
A sneeze can travel 15 feet. Be sure to turn your back if someone has sent one in your direction.