Angle

In geometry, an angle can be defined as the figure formed by two rays meeting at a common endpoint (vertex).

Solid angle

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

Considering its vertex to lie at the center of a sphere, then a measure of its magnitude may be obtained from the ratio between the area (L2) of the surface of the sphere cut off by the angle, and the square (R2) of the sphere’s radius. Solid angles are measured in steradians (sr), an angle of one steradian subtending an angle of area R2 at a distance R.

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