13 sides: Triskaidecagon14 sides: Tetrakaidecagon15 sides: Pentakaidecagon16 sides: Hexakaidecagon17 sides: Heptakaidecagon18 sides: Octakaidecagon19 sides: Enneakaidecagon20 sides: Icosagon
A twenty sided, 2D figure is called an icosagon.
icosagon icosagon
Hendecagon has 11 sides,dodecagon has 12 sides,triskaidecagon has 13 sides,tetradecagon has 14 sides,pentadecagon has 15 sides,hexadecagon has 16 sides,17 sides is heptadecagon,octadecagon have 18 sides,enneadecagon has 19 sides,20 sides is called as icosagon. The prefix of that 9 polygons is Greek. A polygone with 4 sides is called a quadrilateral.
11 Undecagon, Hendecagon 12 Dodecagon 13 Tridecagon, Triskaidecagon 14 Tetradecagon, Tetrakaidecagon 15 Pentadecagon, Pentakaidecagon 16 Hexadecagon, Hexakaidecagon 17 Heptadecagon, Heptakaidecagon 18 Octadecagon, Octakaidecagon 19 Enneadecagon, Enneakaidecagon 20 Icosagon
20 sides
It is not a solid figure because an icosagon is a polygon with 20 sides
An icosagon has just one flat face because it is a polygon that has 20 sides
It need not have any.
An icosagon is a two-dimensional polygon, not a three-dimensional figure. An icosagon has 20 sides - while an icosahedron has 20 faces.
20 sides and 170 diagonals
Icosagon.
icosagon
Icosagon
Icosagon
It is icosagon.it mostly look like a circle
Icosagon.