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Se distingue del círculo en que éste es el
lugar geométrico de los puntos contenidos en
una circunferencia determinada; es decir, la
circunferencia es el perímetro del círculo cuya
superficie contiene.
También se puede describir como la
sección, perpendicular al eje, de una
superficie cónica o cilíndrica, o como
un polígono regular de infinitos lados,
cuya apotema coincide con su radio.