0.5*(172-51) = 119 diagonals
It is called a regular polygon.
A five-sided polygon is called a pentagon.
A ten sided polygon is called a Decagon.
10 side polygon is called decogon
The name of a 119 sided polygon is Tetraenneatetragon.
The name of a 119 sided polygon is enneadecahectagon.
A lot. :)Improved Answer:-119
0.5*(172-51) = 119 diagonals
A polygon with 3 sides is called triangle A polygon with 4 sides is called quadrilateral A polygon with 5 sides is called pentagon A polygon with 6 sides is called hexagon A polygon with 7 sides is called heptagon A polygon with 8 sides is called octagon
For a nine side polygon its called a nonagon.For a nine side polygon its called a nonagon.For a nine side polygon its called a nonagon.
That is called a regular polygon.
A polygon with 10 sides is called...
An 8-sided polygon is called an octagon.
It is called a regular polygon.
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
Shapes with 13 to 20 sides are known as polygons. Specifically, a 13-sided polygon is called a tridecagon, a 14-sided polygon is called a tetrakaidecagon, a 15-sided polygon is called a pentadecagon, a 16-sided polygon is called a hexadecagon, a 17-sided polygon is called a heptadecagon, an 18-sided polygon is called an octadecagon, a 19-sided polygon is called an enneadecagon, and a 20-sided polygon is called an icosagon.