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[2x]

: R RÜ Râ Ré Rô Rö R& R- R. Ra Rb Rc Re Rf Rg Rh Ri Rn Ro Rp Rt Ru Rv Rw Ry

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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

radian

Noun

ra=di=an

WORDNET DICTIONARY

radian(n = noun.quantity) rad - the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees); Array

is a kind of angular unit

has parts: milliradian

radian, n. [From Radius.].

An arc of a circle which is equal to the radius, or the angle measured by such an arc. [1913 Webster]

radian, n. Geom. a unit of angle, equal to an angle at the centre of a circle the arc of which is equal in length to the radius.

Etymology

RADIUS + -AN

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