Yes, because a polygon is a plane (flat) figure. By definition, if it is not flat, it cannot be a polygon.
The term "polygon" refers to flat surfaces - surface on a plane.The term "polygon" refers to flat surfaces - surface on a plane.The term "polygon" refers to flat surfaces - surface on a plane.The term "polygon" refers to flat surfaces - surface on a plane.
square
my deck
cross section
face
a line
a square a rectange a triangle a hexagon an octogon a polygon
A face
A football has a curved surface and polygons are flat. You can approximate a curved surface quite well if you use enough polygons but each polygon will still be flat and a football does have a curved (and rough) surface. Using a few thousand polygons you can create an approximation of a football with stitching seams and every detail but you will not have a curved surface you will have an approximation of a curved surface.
It is a face of the 3-d figure.
a closed, flat figure is a polygon. But it is only a polygon when it is not round.
it is when it is flat