Why is the size of the No. 9 football ball ask some football questions

Ask some football questions
Do you have football sizes? What number do high school students and college students use? What kind of football is better? If possible, provide a website or webpage about football teaching, preferably with teaching videos. What I ask is that beauty is football Please answerWhat is American football? No. 3, No. 5, No. 6, No. 9. What's the use? I'm in grade one. What kind of ball is suitable for me_ Baidu
The ball numbers are arranged according to size. The No. 3 ball is for children. The No. 9 ball is used in the Official NFL game. It is recommended to use the No. 9 ballDiameter of football
However, the size and diameter of football are different. For example, the diameter of No. 6 ball is smaller than that of No. 9 ball, so their diameters are also different. The diameter of No. 6 ball is 27 cm, and the diameter of No. 9 ball is 28.5 cm. Children's rugby is small, so its diameter will be small. Adults are on the contrary. In this way, the design can meet people's different needsWhy is there a difference in the shape and size of the ball between American football and English football
Because these two are not a sport at all. They are all different in terms of rules, venues, balls and costumes. One is called rugby and the other is called football. Even their names are different, but the Chinese translate both into "football"
How big are Rugby numbers 6 and 9, such as length and width
No. 9 is a youth football ball, and No. 9 is a standard adult game ball. Rugby is one of the ball games. It is an antagonistic movement on a rectangular field, through collective cooperation, scoring by shooting or touching the ground with the ball. Rugby originated in 1823 in rugby, England, in 1871Football size
There is a certain difference between English football and American football. The rugby ball is oval shaped like an olive, with a ball length of 27.94 ~ 29.21 cm, a longitudinal perimeter of 76.2 ~ 78.7 cm, a transverse perimeter of 60.96 ~ 64.77 cm, and a ball weight of 382.72 ~ 425.24 G. American football is about 27.94 ~ 28.58 cm long, with a sphereWhat is the size of American football used in NFL
The ball used in the game is No. 9 ball. See the following figure for its size:
Football size
Specification of football: football is oval, and the watch case is sewn with four pieces of corresponding materials. Its long axis is 280mm-300mm, the circumference of the long axis is 760mm-790mm, the circumference of the short axis is 580mm-620mm, and the weight is 400g-440gDoes American football have different sizes
Of course, the NFL standard ball is No. 9 ball, the largest. No. 3 ball is usually played for children under the age of 10. The rest depends on how big your hands are
The difference between Rugby number 9 and number 7
No. 9 is the size of NFL ball, and it is also used in universities. No. 7 is generally used by junior middle school students