A 7 sided shape is a heptagon
A 10 sided polygon is called a decagon (deca meaning 10).
Dodecagon is the name for the regular 12 sided polygon, meaning that all its side lengths and angles are the same. Not sure if there is a name for a general 12 sided 2d shape.
A regular twenty-sided polygon is called an icosagon.
There does not appear to be an accepted name for a 500 sided shape. Where a specific name does not exist for a polygon then it is usually referred to by the NUMBER of sides. A 500 sided polygon is referred to as a 500-gon.
A 32-sided shape is called a "triacontadigon." It is a polygon with 32 sides and 32 angles. The name is derived from the Greek prefixes "triaconta-" for thirty and "-gon" for angle or side.
a rectangle, which has two sets of parallel side
That's a Heptagon or a septagon
A nine sided shape is called a nonagon.
A seven sided shape is called a heptagon or a septagon.......
A 7 sided shape is an heptagon sometimes known as a septagon
No. A five sided shape is a pentagon. A hexagon has six sides.