Linked from
The 29 pages that link to Polygon, each with the reason it gives.
Line segmentNarrower topic: A polygon is assembled from segments joined end to end.
Interior angleNarrower topic: Interior angles are defined at the vertices of polygons.
TessellationNarrower topic: Polygons are the basic shapes used in many familiar tessellations.
QuadrilateralNarrower topic: A quadrilateral is the four-sided member of this broader family.
ParallelogramNarrower topic: Parallelograms belong to the broader family of polygons.
DiagonalNarrower topic: A polygon's vertices and edges establish which pairs are nonadjacent.
DecagonNarrower topic: A decagon is the ten-sided member of this broader family.
Erdős–Nagy theoremNarrower topic: The theorem concerns a particular transformation of polygons.