The radian is a unit of angle defined as the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle.
Instance info
Synonyms
弧度
longcomment
The radian is a unit of angle defined as the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle. The radian is a derived unit in the International System of Units.
symbol
rad
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Types