Question

What is the unit of plene angle? A) radian b) steradian c) meter d) second

Answer 1

radian

A plane angle, θ, made up of the lines from two points meeting at a vertex, is defined by the arc length of a circle subtended by the lines and by the radius of that circle, as shown below. The dimensionless unit of plane angle is the radian, with 2π radians in a full circle.

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