In geometry a henagon (or monogon) is a polygon with one edge and one vertex. It has Schläfli symbol {1}. Since a henagon has only one side and only one interior angle, every henagon is regular by definition.

In Euclidean geometry, a henagon is usually considered to be an impossible object, because its single edge would extend to infinity.

Two henagons can be used to construct a dihedron on a sphere, with Schläfli symbol, {1,2}.

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