Assertion: rhombus's angle | /r/HasProperty | allowed under some definitions of polygon
Facets:
Source sentences:
text: But then I thought about it and realized that the only self-intersecting equilateral quadrilateral would be the type of degenerate case you mentioned (although the angle between the first two sides could be 180 degrees (allowed under some definitions of polygon), or 0, in which case it's even more degenerate, and all four sides are coincident), and thought that that couldn't possibly be considered a polygon, so I undid that revision.