A side is one of several kinds of elements that form a geometric boundary. A side of an angle is either of the two rays having their common endpoint at the vertex. A side of a polygon is one of the line segments joining consecutive vertices and forming its boundary. More specifically, it is a polygon edge. For a polyhedron, the word "side" is sometimes used informally for a face, although "face" is the more precise term.

For a directed angle, the initial side is the ray from which the rotation begins and the terminal side is the ray at which it ends.

See also

Angle, Face, Initial Side, Polygon Edge, Ray, Terminal Side, Vertex

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References

Hadamard, J. Lessons in Geometry, I: Plane Geometry. Providence, RI: Amer. Math. Soc., 2008.

Referenced on Wolfram|Alpha

Side

Cite this as:

Weisstein, Eric W. "Side." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Side.html

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