A digon is a polygon with two edges. It is degenerate in normal euclidean space, though in some geometries, such as on the surface of a sphere, it can exist.

Visualisation Edit

Draw two points on a sphere. Then, draw a line going from the first point to the second, then continuing around the sphere back to the first. This act puts two vertices on the surface of the sphere, two edges, and divides the sphere into two sections - the "inside" and "outside" of the digon.

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