Don't count the red tile. the smallest ring has 6 blue tiles in it. the next ring has 12 yellow tiles. count the number of green tiles in the third ring. based on the pattern established by the first three rings, how many tiles are there in the 25th ring of white tiles, counting outward from the central red tile?

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