A polygon have 4 or more sides. It has no gaps between it. Regular polygons usually have six or ten sides.
A polygon
polyhedron
It is a seven-sided polygon
It looks like a circle
Join up the hour-markers on a clock face and you will have a dodecagon - a 12 sided polygon.
A polygon
Like this
the polygon would be a square
A polygon is a plane figure that is closed with straight line segments.
it look like a fifty sided shape
polyhedron
Polygon
It is a seven-sided polygon
The Pentagon.
It is a quadrilateral.
a triangle.
Since there is no need for it to be a regular polygon, it will look like a closed loop.