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
3 sides: triangle 4 sides: quadrilateral 5 sides:pentagon 6 sides:hexagon 7 sides: heptagom 8 sides: octagon 9 sides: nonagon 10 sides: decagon 11 sides: unodecagon ? 12 sides: duodecagon 13 sides: trisca-decagon? 14 sides: ( I am tired on making up names- try quator-decagon, or look it up.)
Endecagon or hendecagon.An undecagon has 11 sides
An hendecagon is an 11 sided polygon
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.
All polygons, including an undecagon (11-sided figure) have a sum of exterior angles of 360 degrees.
The first ten polygons in order of names and sides are as follows:- Triangle has 3 sides Quadrilateral has 4 sides Pentagon has 5 sides Hexagon has 6 sides Heptagon has 7 sides Octagon has 8 sides Nonagon has 9 sides Decagon has 10 sides Undecagon has 11 sides Dodecagon has 12 sides
Look around you. How many 11-sided polygons do you see?
But it is because an 11 sided polgon is called an undecagon
hendecagon
3 sides: triangle 4 sides: quadrilateral 5 sides:pentagon 6 sides:hexagon 7 sides: heptagom 8 sides: octagon 9 sides: nonagon 10 sides: decagon 11 sides: unodecagon ? 12 sides: duodecagon 13 sides: trisca-decagon? 14 sides: ( I am tired on making up names- try quator-decagon, or look it up.)
A polygon has 3 or more sides and some of the better known of them with names and sides are as follows:- Triangle has 3 sides Quadrilateral has 4 sides Pentagon has 5 sides Hexagon has 6 sides Heptagon has 7 sides Octagon has 8 sides Nonagon has 9 sides Decagon has 10 sides Undecagon has 11 sides Dodecagon has 12 sides The list can go on and on but its perfectly acceptable to call as for example a 30 sided polygon a 30-agon.
Number of triangles in a polygon is determined by (n-2) = number of triangles, whereas n is the number of sides of the polygon
The name of a 11 sided polygon is Hendecagon.
a hendecagon has 11 sides =)
Polygons can be either regular or irregular and have special names:- triangle has 3 sides quadrilateral has 4 sides pentagon has 5 sides hexagon has 6 sides heptagon has 7 sides octagon has 8 sides nonagon has 9 sides decagon has 10 sides undecagon has 11 sides dodecagon has 12 sides and there are many more polygons with special names
Endecagon or hendecagon.An undecagon has 11 sides
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon