radian

(Inglês)

In the International System of Units, the derived unit of plane angle: the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle.

Pronunciado como (IPA)
/ˈɹeɪdiən/
Etimologia (Inglês)

From radius + -an.

source of light

photosource

luminous source

optical source

radian measure

illuminating source

light source luminaire

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