In spherical geometry, a digon looks like a coloured panel of a typical beach ball. [my own observation: If one of these panels were flattened out on a plane, it would be two intersecting curved arcs, which would form two sides, if one accepts the curved side of a circle as a one-sided figure.]
Sep 07 2013, 11:20 PM
Answer has 2 votes
TimBentley 11 year member
Answer has 2 votes.
Since a circle was mentioned in the question, we're not restricted to polygons, so a crescent or semicircle also have two sides. You could also have a shape with two different curves in opposite directions, but I don't know what that would be called.