Because that is the ratio of a circle's circumference to its diameter.
6x7 equle = 42
36
11 yards
63
10.8
the first 12 digits of pi
64.
1,000,000 ml
almost the same
How about: 228/2 = 114 as one example
14 kilometers is 14,000 meters.
719 divided by 6 = 119.83