Assertion: regular polygon's side | /r/HasProperty | straight
Facets:
Source sentences:
text: The sides must be straight.
text: The sides are the straight line segments that make up the polygon.
text: Regular polygons have all straight sides equal in length and all interior angles equal.
text: There must be at least three sides, but there is no upper limit to the total number of sides, as long as all the sides are straight.