An equilateral triangle.
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.
A shape with 6 sides is called a hexagon. It's a two-dimensional flat shape with straight sides. The word "hexagon" comes from the Greek words "hexa" meaning "six" and "gonia" meaning "corner" or "angle". So, a hexagon has six corners and six angles as well.
pentagon
hexagon
A square.
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.
They are called 'irregular galaxies"