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A football or soccer ball is the ball used in the sport of association football. The ball's spherical shape, as well as its size, weight, mass, and material composition, are specified by Law 2 of the Laws of the Game maintained by the International Football Association Board . [ 1 ]
Two different balls were used in the final: Argentina supplied the first-half ball (the 'Tiento') and led 2–1 at the break; hosts Uruguay supplied the second-half ball (the 'T-Model' which was larger and heavier) [4] and won 4–2. [4] [5] 1934: Federale 102 ECAS (Ente Centrale Approvvigionamento Sportivi), Rome [6] 1938: Allen Allen, Paris
The surface area and the volume of the truncated icosahedron of edge length are: [2] = (+ +) = +. The sphericity of a polyhedron describes how closely a polyhedron resembles a sphere. It can be defined as the ratio of the surface area of a sphere with the same volume to the polyhedron's surface area, from which the value is between 0 and 1.
A slightly different ball named "Telstar" was used as the official match ball of the 1970 FIFA World Cup in Mexico. [2] The similar "Telstar Durlast" was one of two official balls, along with the Chile Durlast, of the 1974 FIFA World Cup held in West Germany. [2] [3] The ball was also used in the 1972 and 1976 European Championships.
Adidas Tricolore, the official ball for the 1998 World Cup. Law 2 of the game specifies that the ball is an air-filled sphere with a circumference of 68–70 cm (27–28 in), a weight of 410–450 g (14–16 oz), inflated to a pressure of 0.6 to 1.1 atmospheres (60–111 kPa or 8.7–16.1 psi) "at sea level", and covered in leather or "other suitable material". [7]
The game is played using a spherical ball of 68–70 cm (27–28 in) circumference, [95] known as the football (or soccer ball). Two teams of eleven players each compete to get the ball into the other team's goal (between the posts and under the bar), thereby scoring a goal.