11 regular hendecagon
12 regular dodecagon
13 regular triskaidecagon
14 regular tetradecagon
15 regular pentadecagon
16 regular hexadecagon
17 regular heptadecagon
18 regular octadecagon
19 regular enneadecagon
20 regular icosagon
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Oh, dude, you're really making me work here! Okay, let's see... so, a polygon with 11 sides is called a hendecagon, then you've got a dodecagon with 12 sides, a tridecagon with 13 sides, a tetradecagon with 14 sides, a pentadecagon with 15 sides, a hexadecagon with 16 sides, a heptadecagon with 17 sides, an octadecagon with 18 sides, an enneadecagon with 19 sides, and finally, a 20-sided polygon is called an icosagon. Like, who even uses these names in real life, right?
Sure, polygons with 11 sides to 20 sides are as follows: 11 sides - undecagon, 12 sides - dodecagon, 13 sides - tridecagon or triskaidecagon, 14 sides - tetradecagon, 15 sides - pentadecagon, 16 sides - hexadecagon, 17 sides - heptadecagon, 18 sides - octadecagon, 19 sides - enneadecagon or nonadecagon, and 20 sides - icosagon.
Oh, how wonderful! Let's paint a happy little picture with our shapes. A polygon with 11 sides is called a hendecagon, while a polygon with 12 sides is called a dodecagon. Moving along, a polygon with 13 sides is called a tridecagon, and so on up to a 20-sided polygon, which is called an icosagon. Just remember, each shape is unique and special in its own way.
3 sides= triangle 4 sides= quadrilateral 5 sides= pentagon 6 sides= hexagon 7 sides= heptagon 8 sides= octagon 9 sides= nonagon 10 sides= decagon 11 sides= hendecagon 12 sides= dodecagon 13 sides= tridecagon/13-gon 14 sides= tetradecagon/14-gon 15 sides= pentadecagon/15-gon 16 sides= hexadecagon/16-gon 17 sides= heptadecagon/17-gon 18 sides= octadecagon/18-gon 19 sides= enneadecagon/19-gon 20 sides= icosagon/20-gon 30 sides= triacontagon/30-gon 40 sides= tetracontagon/40-gon 50 sides= pentacontagon/50-gon 60 sides= hexacontagon/60-gon 70 sides= heptacontagon/70-gon 80 sides= octcontagon/80-gon 90 sides= nonacontagon/90-gon 100 sides= hectagon/100-gon 1,000 sides= chiliagon/1,000-gon 10,000 sides= myriagon/10,000-gon 100,000 sides= decimyriagon/100,000-gon 1,000,000 sides= hecatommyriagon/1,000,000-gon Since there are infinitely many polygons, it is impossible to list the names of all of them.
number of sidesname of polygon3triangle4quadrilateral5pentagon6hexagon7heptagon8octagon9nonagon10decagon11hendecagon12dodecagon13tridecagon or triskaidecagon14tetradecagon15pentadecagon, pentakaidecagon or quindecagon16hexadecagon or hexakaidecagon17heptadecagon, heptakaidecagon, or septadecagon18octadecagon or octakaidecagon19enneadecagon, enneakaidecagon, or nonadecagon20icosagon30triacontagon40tetracontagon50pentacontagon60hexacontagon70heptacontagon80octacontagon90enneacontagon or nonacontagon100hectagon1000chiliagon10000myriagon1000000hecatommyriagon or hekatommyriagon10100 googolgon
11- undecagon 12- dodecagon 13- 13-gon 14- 14-gon 15- 15-gon 16- 16-gon 17- 17-gon 18- 18-gon 19- 19-gon 20- 20-gon
Kinds of polygons with their meanings are: Convex (all diagonals are internal), concave (at least one diagonal is outside the shape), equilateral (equal sides), equiangular (equal angles), regular (equal angles and sides), irregular, (no equal angles and sides), triangle (3 sides), quadrilateral (4 sides), pentagon (5 sides), hexagon (6 sides), heptagon (7 sides), octagon (8 sides), enneagon or nonagon (9 sides), decagon (10 sides), hendecagon (11 sides), dodecagon (12 sides), tridecagon or triskaidecagon (13 sides), tetradecagon or tetrakaidecago (14 sides), pendedecagon (15 sides), hexdecagon (16 sides), hepdecagon (17 sides), ocdecagon (18 sides), enneadecagon (19 sides) and icosagon (20 sides).
360/18 = 20 sides, or any multiple of 20 sides.360/18 = 20 sides, or any multiple of 20 sides.360/18 = 20 sides, or any multiple of 20 sides.360/18 = 20 sides, or any multiple of 20 sides.