单词	radian
释义	English American radiannoun [ C ] /ˈreɪ.di.ən/us/ˈreɪ.di.ən/specialized the measure of an angle at the centre of a circle opposite an arc (= part of the edge of a circle) that is the same length as the radius (= the line from the centre to the edge of the circle) Thesaurus: synonyms and related words Geometry: describing angles, lines & orientations angle of incidence antinode asymptote asymptotic axial corresponding angle erect horizontal oblique parallel plumb prominent reflection right angle slant supplementary angle tangent tangential transversal vanishing point See more results » You can also find related words, phrases, and synonyms in the topics: Miscellaneous units of measurement radiannoun [ C ] us/ˈreɪ·di·ən/ geometry the measure of an angle at the center of a circle opposite an arc (= part of the edge of a circle) that is the same length as the radius (= line from the center to the edge of the circle)
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