Comparing balls
Classify these 9 balls in the increasing order of their volume.
| 1 : Petanque: radius 45 to 55 mm | 4 : Faust-Ball: perimeter 65 to 67 cm | 7 : Platform Tennis: diameter 6.4 cm |
| 2 : Cricket: perimeter 23 cm | 5 : Football: perimeter 68 to 70 cm | 8 : Racquetball: diameter 5.7 cm |
| 3 : Cycle-Ball: diameter 16 to 18 cm | 6 : Half-Court: diameter 63 mm | 9 : Tchouk-Ball: diameter 185 to 191 mm |