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  2. Tueller Drill - Wikipedia

    en.wikipedia.org/wiki/Tueller_Drill

    The "21-foot rule" has been implemented in some police department policies, and was the focus of a dissent in the excessive force case Buchanan v. City of San Jose where police officers shot a knife wielding person at a distance of 55 feet. [3] MythBusters covered the drill in the 2012 episode "Duel Dilemmas". At 20 ft (6.1 m), the gun-wielder ...

  3. Twenty-one (basketball) - Wikipedia

    en.wikipedia.org/wiki/Twenty-one_(basketball)

    Twenty-one, also called play21basketball, cutthroat, hustle, tip-it, noyceball, roughhouse, scutter, rough, or rebound [1] is a popular variation of street basketball.The game is played with any number of players on a half court, but typically when not enough players are available to at least play three-on-three.

  4. List of gridiron football rules - Wikipedia

    en.wikipedia.org/.../List_of_gridiron_football_rules

    At each goal line is a set of 40-foot-high (12 m) goalposts, which consist of two uprights joined by a 18.5-foot-long (5.6 m) crossbar which is 10 feet (3.0 m) above the goal line. The goalposts may be H-shaped (both posts fixed in the ground) although in the higher-calibre competitions the tuning-fork design (supported by a single curved post ...

  5. The Big Ten Is Officially Changing Its 21-Day Rule - AOL

    www.aol.com/big-ten-officially-changing-21...

    According to ESPN’s Adam Rittenberg, the league has decided to change its 21-day rule regarding positive COVID-19 tests. The Buckeyes just got even more good news, courtesy of the Big Ten.

  6. Flight level - Wikipedia

    en.wikipedia.org/wiki/Flight_level

    The rule affected only those aircraft operating under IFR when in level flight above 3,000 ft above mean sea level, or above the appropriate transition altitude, whichever is the higher, and when below FL195 (19,500 ft above the 1013.2 hPa datum in the UK, or with the altimeter set according to the system published by the competent authority in ...

  7. Tennis court - Wikipedia

    en.wikipedia.org/wiki/Tennis_court

    The court is 78 ft (23.77 m) long. Its width is 27 ft (8.23 m) for singles matches and 36 ft (10.97 m) for doubles matches. [2] The service line is 21 ft (6.40 m) from the net. [2] Additional clear space around the court is needed in order for players to reach overrun balls for a total of 60 ft (18 m) wide and 120 ft (37 m) long.

  8. Naismith's rule - Wikipedia

    en.wikipedia.org/wiki/Naismith's_rule

    Naismith's rule helps with the planning of a walking or hiking expedition by calculating how long it will take to travel the intended route, including any extra time taken when walking uphill. This rule of thumb was devised by William W. Naismith , a Scottish mountaineer , in 1892.

  9. National Hockey League rules - Wikipedia

    en.wikipedia.org/wiki/National_Hockey_League_rules

    This rule is widely referred to as the "Brodeur rule", after New Jersey Devils goalie Martin Brodeur, whose puck handling behind the net is believed to be the cause for the rule. [ 2 ] [ 3 ] In 2014, the NHL lengthened the goal-line side of the trapezoid by 2 feet (0.61 m) on both sides of the net.