radian

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Definitions from WordNet

Noun radian has 1 sense

radian, 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)
--₁ is a kind of angular unit
--₁ has parts: milliradian

Definitions from the Web

Radian

Noun:

A unit of measurement for angles, equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.

Example Sentence:

He measured the angle in radians to calculate the circumference of the circle.

Adjective:

Referring to the measurement or calculation in radians.

Example Sentence:

The radian measurement system is widely used in mathematics and physics.

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