9ft because to get circumference you multiply by π (pi or 3.14) so to get circumference you just do it the other way around like:
28 ➗π (3.14) = 8.91710...
Which rounds to 9. So, the diameter is 9ft. I hope I helped and just message me if you need anything else!
Step-by-step explanation: So we're looking at 3blue+2red is less than or equal to the 22 blue beads and 15 red beads. The closest you could get is using 21 blue beads and 14 red beads which is 7 necklaces.