# Symmetry in Graphs of Functions and Relations

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This Demonstration shows the three types of symmetry commonly studied in graphs: symmetry with respect to the axis, the axis, or the origin.

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Contributed by: Laura R. Lynch (June 2014)

Open content licensed under CC BY-NC-SA

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## Details

The graph of a function that is not identically zero is never symmetric with respect to the axis as it necessarily fails the vertical line test (e.g. and ). A function whose graph is symmetric with respect to the axis is called even (e.g. and ). A function whose graph is symmetric with respect to the origin is called odd (e.g. ).

Equations that are symmetric to both the axis and axis will necessarily also be symmetric with respect to the origin (e.g. ). However, this is not a requirement for a graph to be symmetric with respect to the origin (e.g. ).

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