How many times longer is the diameter of a grain of sand than the diameter of the average cell in the human body? show your work. if the diameter of a grain of sand is about 2 x 10-4 meters and the diameter of a human hair is about 0.25 meters.

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

they used 313 gallons of paint