Angle -- from Wolfram MathWorld

Given two intersecting lines or line segments, the amount of rotation about the point of intersection (the vertex) required to bring one into correspondence with the other is called the angle theta between them. The term "plane angle" is sometimes used to distinguish angles in a plane from solid angles measured in space (International Standards Organization 1982, p. 5). The term "angle" can also be applied to the rotational offset between intersecting planes about their

Dihedral Angle -- from Wolfram MathWorld

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Vertex Angle -- from Wolfram MathWorld

Angles: Definition, Parts, Types, Degrees, Properties, Examples

Solid Angle -- from Wolfram MathWorld

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