History Key (basketball)

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originally, key narrower today , had shape of keyhole, measuring 6 feet (1.8 m) wide, hence key , free-throw circle head, , shaded lane body. has been called cup or bottle in other languages, because of how looks other perspectives. due narrowness of key, imposing centers, such george mikan, dominated paint, scoring @ will. counter this, key widened 12 feet (3.7 m) 6 feet (1.8 m) @ onset of 1951–52 nba season.


men s professional basketball in united states (notably national basketball association) widened further 16 feet (4.9 m) in 1964–65 nba season lessen effectiveness of centers, wilt chamberlain. ncaa retains 12‑foot key day.


on april 25, 2008, fiba central board approved rule changes included changes in shape of key; key rectangular , has virtually same dimensions key used in nba. in addition, no-charge semicircle formally called restricted area arc created. change took effect in 2010.








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