How big can football be, how big is Chinese football

Sphere circumference:

FIFA approved eligibility criteria: cm cm.

Weight: FIFA approved eligibility criteria: The weight of the football is between 420 445 grams.

It consists of 32 regular sides, 20 regular hexagons, and 12 regular pentagons, but the 2006 World Cup match ball "+teamgeist" has been reduced to 14 pieces for the first time. What makes the "+TeamGeist" extraordinary is that it revolutionizes the reduction of the spherical surface to 14 pieces, whereas all football surfaces have previously consisted of 32 skins. As a result, the number of splicing points on the outer surface of the ball has been reduced by 60% to 24, and the total length of the splicing line has been reduced by more than 15% from centimeters to centimeters.

This piece design, combined with Adidas' unique seamless lamination technology, makes the "+ Team Star" show unprecedented performance. This is evidenced by large-scale comparison tests conducted at Loughborough University in the UK and the adidas laboratory in Scheinfeld in Germany.

You can also use the formula to calculate that the number of pentagons is x, then the number of hexagons is 32-x5x+(32-x)*6=e*2 (two skins for each edge) 5x+(32-x)*6=v*3 (for each vertex with 3 skins) v+32-e=2 (Euler's formula).

The solution is x=12

So there are 12 pieces of pentagonal type and 20 pieces of hexagonal type.

The circumference of the sphere shall not exceed 70 cm (28 inches) and shall not be less than 68 cm (27 inches).

The weight of the ball, at the start of the match, shall not exceed 450 grams but shall not be less than 410 grams.

The air pressure of the ball, at sea level, is to atmospheric pressure.

Chinese football is as big as football in other countries, and it will break out of Asia and go to the world in the future, creating the glory of Chinese football

According to the regulations, the circumference of the football should not be more than 71 centimeters or less than 68 centimeters, and according to the formula for calculating the surface area of the sphere, the surface area of a football should be between 1465 square centimeters and 1603 square centimeters.

Generally, the ball used for the game is a square centimeter.

The ball shall be round, its shell shall be made of leather or other permitted material, and no material may be used in its construction that may injure the player.

The circumference of the ball must not be more than 71 cm or less than 68 cm. The weight of the ball, which must not be more than 453 grams or less than 396 grams at the start of the game. After inflation, the pressure should be equal to 0 6-1 1 atmospheres (at sea level), i.e. equal to 600-1100 gram centimeters'.

During the game, the match ball may not be changed without the permission of the referee.

International Council Resolution:

1.The ball used in the game is the property of the association or club to which the playing field belongs, and the ball shall be handed over to the referee at the end of the game.

2.The International Council determines the material used to make the balls at any time. Any licensed material shall be approved by the International Council.

3.The rules approved by the International Council set the equivalent weight of a ball: 14 to 16 taels equal to 396 to 453 grams.

4.If the ball breaks or leaks air during the game, play should be stopped immediately and play should be resumed with a new ball at the point where the original ball was broken. Play shall resume unless the ball is in the goal area at the time the ball is in the goal area, in which case the ball shall be dropped on the line of the goal area parallel to the goal line closest to the point where the ball is located at the time play is stopped.

5.If the ball is broken in the event of a dead ball, the new ball shall be applied to the appropriate referee and shall be exchanged at the time of the match.

The size of the ball used in a regular large-scale event is between the circumference, that is, the diameter. Some of the No. 5 balls used as second-class products and third-class products will have a larger diameter and a fluctuation size of each centimeter.

Flickering candlelight to light up your birthday; Affectionate chanting, sending me infinite blessings; Shooting stars in the sky, fulfill your every wish; Put the cake in your mouth, smile on your face, and sweeten it in your heart. Although you and we are separated from each other, if our hearts know the direction of Lingxi, even if we can't be accompanied day and night, the moonlight of love will illuminate your dreams and mine. The train entered the tunnel, and it was dark, and only a kiss and then a slap were heard.

Except for the tunnel, the train didn't squeak from the four people who didn't know each other, only the eyes of the man A were blue. The old woman thought, "The little girl is beautiful and beautiful."

The girl thought, "It's strange that an old woman doesn't kiss me either." A thinks:

b is so cunning, I was beaten when I kissed my mouth" b thought: "I kissed the back of my hand and slapped a slap again, and no one noticed. "I miss just composing the melody, I love you can't help but meet on the piano, what a soft emotion, coincide together, please forgive me for never leaving, because time stays there with you.

For most of life, commitment is synonymous with bondage, but we yearn for bondage.

Before 1872, there were no official rules for the size of football, and the size of the ball was varied. The British first thought of setting the size of the football, and in 1872 the FA stipulated that the circumference of the football must be between 27 and 28 inches (i.e. to the centimeter). In 1973, the weight of the soccer ball was regulated, between 410 and 450 grams, and the circumference was limited to 68 to 70 centimeters.

We know that football has always followed this specification until now.

The circumference of a standard soccer ball should not be longer than 70 centimeters and no shorter than 68 centimeters.

From this, it is estimated that its diameter is between centimeters and centimeters.

The weight is between 396 grams and 453 grams.

The circumference of the ball for official matches is 68cm-71cm

Ball Rule Description 1: The ball is round and is a recognized dark orange;

2. The shell is made of leather, glue or synthetic substance;

3. The circumference shall not be less than meters (cm) and shall not be greater than meters (78 cm);

4. The weight shall not be less than 567 grams and shall not be more than 650 grams;

5. After inflation, make the ball fall from the height of the meter (measured from the bottom of the ball) to the ground of the court, and the height of the ball shall not be lower than the meter and shall not be higher than the meter (measured from the top of the ball);

6. The width of the seam or groove of the spherical surface shall not exceed meters (mm).

7. The home team must prepare at least two used balls that meet the above specifications. The referee is the sole appraiser who determines whether the ball is up to standard.