radius

From Wiktionary
Jump to navigation Jump to search

Pronunciation[change]

  • IPA: /ˈɹeɪdi.əs/
  • (file)

Noun[change]

Singular
radius

Plural
radii or radiuses

  1. (mathematics); (countable) A radius is a straight line between the centre of a circle and its circumference.
    To find the area of a circle, you have to know the length of the radius.