Litell, Mifflin. Incorporated Mathematics. Evanston, IL: 1995.

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"Ball (tennis), Diam. 6.5cm, 57g, hollow inner construction and also a fabric covered exterior construction"57g
Tennis. Americana Online."The sphere is a cloth-covered rubber ball that is generally yellow in color, approximately 2½ inch (6.35cm) in diameter and 2 ounces (56.69 grams) in weight"56.69g
Sports A come Z: Tennis: Equipment. United claims Olympic Committee."A tennis round is hollow and also composed of inflated rubber spanned with a fabric. That is between 2½"and 25/8"(6.35 and 6.67cm) in diameter and weighs in between 2 and 21/16 ounces (57.7 and also 58.5 grams)."56.7–58.5g
New Encyclopedia Britannica. 15th ed. 1997."The ITF states that the ball have to be between 2½ inches (6.35cm) and 2 5/8 inch in diameter and also between 2 ounces (56.7g) and also 2 1/16 ounces in weight"56.7g
World book Encyclopedia. Chicago: civilization Book, 1998."It have to weigh much more than 2 ounces (56.7 grams) yet less than 2 1/16 ounces in weight"56.7–58.5g

Tennis is an out or indoor game, i beg your pardon is played on a rectangular court by two persons (known together singles) or by four persons (doubles). Rackets are offered to fight the ball back and forth across a net. The thing of the video game is come score clues by to mark the sphere in a method that an adversary can not effectively return it. The origins of the game dates ago to the rock Age, once humans first used your clubs come hit rocks ago and forth throughout barricades of dirt and stone. The tennis court is 78feet (23.8meters) long, and its divided into equal sides by a net the stands 3feet (0.9meters) high at the center of the court. Because that singles, the court is 27feet (8.2meters) wide. For doubles the width is boosted to 36feet (11meters). A tennis ball is hollow and also composed that inflated rubber, spanned with a fabric which need to be uniform. Its between 2½ and 25/8inches (6.35 and also 6.67cm) in diameter and also weighs between 2 and 21/16 ounces (57.7 and also 58.5 grams). Yellow and also white balls are supplied in competition. Once dropped ~ above concrete indigenous a height of 100 inch (2.5meters), they need to bounce increase from 53 to 56 inches (135 to 147 centimeters). The offer is the most vital stroke in tennis. There room no weight restrictions on the racket and it is generally strung with sturdy gut or nylon. The surface ar of the court may be grass, clay, or some sort of difficult material which is commonly concrete, asphalt, artificial turf, or wood. The court surface is an essential element in tennis because balls bounce greater or lower, faster or slower, relying on the surface they strike. There is a tendency to slide on clay if harder surface are ideal for fast starts and stops.

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