pentagon
A square.
A shape with 8 equal sides is called a regular octagon.
A nine sided shape that is called a regular nonagon.
A shape with three sides is called a triangle. A shape with ten sides is called a decagon.
pentagon
A square.
hexagon
The shape is called a decagon. If all the sides and angles are the same, it is called a regular decagon.
A regular 5-sided shape is called a pentagon.
Regular polygons
A shape with 8 equal sides is called a regular octagon.
Six sided shapes are called hexagons. If all 6 sides are the same size, then the shape is called a regular hexagon.
A nine sided shape that is called a regular nonagon.
A regular fifty-sided polygon is called a pentacontagon.
It is tessellating where there are no gaps or overlaps.
A regular polygon