Radians
What is a radian? A radian is the angle subtended at the center of a circle by an arc as long as the radius; an arc of 1 meter on a circle of radius 1 meter…
About these units
A radian is the angle subtended at the center of a circle by an arc as long as the radius; an arc of 1 meter on a circle of radius 1 meter subtends 1 radian.
Also known as
radian · radians · rad
Source: BIPM, The International System of Units (SI), 9th edition
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