0.08267716535 in
Direct Conversion Formula 2.1 mm*
1 in
25.4 mm
=
0.08267716535 in
21 inches = 533.4 millimeters.
21 mm is about 0.827 inches.
0.8267716535 in Direct Conversion Formula 21 mm* 1 in 25.4 mm = 0.8267716535 in
32.81 mm is about 1.291 inches.
101.46 mm = 3.9945 inches, approx.
139mm is 5.47244 inches.
According to www.cdnfootball.info: "Canadian Football League rules specify that the long circumference of the ball should be not less than 27¾ inches (705 mm) nor greater than 28¼ inches (718 mm), while the short axis should be no less than 20⅞ inches (530 mm) nor greater than 21⅛ inches (537 mm). The dimensions of the official National Football League and National Collegiate Athletic Association football are specified by its manufacturer as: short circumference: 20¾ to 21¼ inches (527 to 540 mm), long circumference 27¾ to 28½ inches (705 to 724 mm)."
270 mm = 10.6299 "
1 inch equals 25.4mm If we divide 21mm by 25.4mm we get .8267 inches or approximately 53/64" I hope that answers your question. Direct Conversion Formula 21 mm* 1 in 25.4 mm = 0.8267716535 in
0.82677" Direct Conversion Formula 21 mm*1 in 25.4 mm=0.8267716535 in
8.77 inches
650 mm = 25.59"