Category:Definitions/Solid Angles

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This category contains definitions related to Solid Angles.
Related results can be found in Category:Solid Angles.

In the words of Euclid:

A solid angle is the inclination constituted by more than two lines which meet one another and are not in the same surface, towards all the lines.
Otherwise: A solid angle is that which is contained by more than two plane angles which are not in the same plane and are constructed to one point.

(The Elements: Book $\text{XI}$: Definition $11$)