Question

Define plane angle and solid angle, Write its S.I. unit​

Answer 1

Answer:

The dimensionless unit of plane angle is the radian, with 2π radians in a full circle. A solid angle, ω, made up of all the lines from a closed curve meeting at a vertex, is defined by the surface area of a sphere subtended by the lines and by the radius of that sphere, as shown below.

Explanation:

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