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2. Bowling ball - Wikipedia

   en.wikipedia.org/wiki/Bowling_ball

   Bowling ball. Comparative sizes of bowling balls, portrayed on boards of a bowling lane. A bowling ball is a hard spherical ball used to knock down bowling pins in the sport of bowling. Balls used in ten-pin bowling and American nine-pin bowling traditionally have holes for two fingers and the thumb. Balls used in five-pin bowling, candlepin ...

3. United States customary units - Wikipedia

   en.wikipedia.org/wiki/United_States_customary_units

   Length. For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use. From 1893, the foot was legally defined as exactly 1200⁄3937 m (approximately 0.304 8006 m). [13] Since July 1, 1959, the units of length have been defined on the basis of 1 yd = 0 ...

4. Bowling pin - Wikipedia

   en.wikipedia.org/wiki/Bowling_pin

   Pin specifications are set by the United States Bowling Congress (USBC). World Bowling, formerly World Tenpin Bowling Association, has adopted the USBC specifications. Pins are 15 inches (380 mm) tall, 4.75 inches (121 mm) wide at their widest point, and weigh 3 pounds 8 ounces (1.6 kilograms) ±2 ounces (0.057 kilograms). [2]

5. Go equipment - Wikipedia

   en.wikipedia.org/wiki/Go_equipment

   Board. An empty Go board, with the 19×19 intersecting lines. The Go board, called the goban 碁盤 in Japanese, is the playing surface on which to place the stones. The standard board is marked with a 19×19 grid. Smaller boards include a 13×13 grid and a 9×9 grid used for shorter games that are often used to teach beginners.

6. Ten-pin bowling - Wikipedia

   en.wikipedia.org/wiki/Ten-pin_bowling

   Ten-pin bowling. Ball contacts the 1, 3, 5, and 9 pins (sequentially tinted red) to achieve a strike. Ten-pin bowling is a type of bowling in which a bowler rolls a bowling ball down a wood or synthetic lane toward ten pins positioned evenly in four rows in an equilateral triangle. The goal is to knock down all ten pins on the first roll of the ...

7. Ball (association football) - Wikipedia

   en.wikipedia.org/wiki/Ball_(association_football)

   Regulation size and weight for a football is a circumference of 68–70 cm (27–28 in) and a weight of 410–450 g (14–16 oz). The ball is inflated to a pressure of 0.6–1.1 bars (8.7–16.0 psi) at sea level. [20] This is known as "Size 5". Smaller balls, Sizes 1, 3, and 4, are also produced for younger players or as training tools. [20]