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Радиус – УикипедияРадиус (остар. полупречник) наричаме разстоянието от центъра до периферията на окръжност или сфера. Радиусът обикновено се обозначава с малката латинска буква r. Използва се във формулата за изчисляване на дължината на окръжност и формулата за изчисляване на лице на кръг. Терминът идва от латинската дума radius, която означава „лъч", но също так…
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