Question

Definition of plane angle and solid angle​

Answer 1

Answer

A solid angle is a 3D angular volume that is defined analogously to the definition of a plane angle in two dimensions. ... 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.

Explainaton:-

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Answer 2

Answer:

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A solid angle is a 3D angular volume that is defined analogously to the definition of a plane angle in two dimensions. ... 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....

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