Polygon Names: 2026 Names From 3 to Sides

When people search for polygon names, they are usually looking for an easy way to identify shapes based on their number of sides. From familiar triangles and squares to enormous polygons with hundreds of sides, each shape can be described using a specific name or an n-gon label.

This guide explains how polygon naming works and gives you distinct polygon names, making it easier to recognize, study, teach, or label geometric shapes.

Polygon Names for the First 15 Side Counts

The simplest place to learn polygon names is with small side counts, where many shapes have familiar traditional names used in everyday geometry.

1. Triangle — a polygon with 3 sides.
2. Quadrilateral — a polygon with 4 sides.
3. Pentagon — a polygon with 5 sides.
4. Hexagon — a polygon with 6 sides.
5. Heptagon — a polygon with 7 sides.
6. Octagon — a polygon with 8 sides.
7. Nonagon — a polygon with 9 sides.
8. Decagon — a polygon with 10 sides.
9. Undecagon — a polygon with 11 sides.
10. Dodecagon — a polygon with 12 sides.
11. Tridecagon — a polygon with 13 sides.
12. Tetradecagon — a polygon with 14 sides.
13. Pentadecagon — a polygon with 15 sides.
14. Hexadecagon — a polygon with 16 sides.
15. Heptadecagon — a polygon with 17 sides.

Polygon Names for Shapes With 18 to 32 Sides

Once polygons become larger, systematic naming becomes more useful because the number of sides can be expressed clearly with an appropriate polygon term.

1. Octadecagon — 18 sides.
2. Enneadecagon — 19 sides.
3. Icosagon — 20 sides.
4. Icosikaihenagon — 21 sides.
5. Icosikaidigon — 22 sides.
6. Icosikaitrigon — 23 sides.
7. Icosikaitetragon — 24 sides.
8. Icosikaipentagon — 25 sides.
9. Icosikaihexagon — 26 sides.
10. Icosikaiheptagon — 27 sides.
11. Icosikaioctagon — 28 sides.
12. Icosikaienneagon — 29 sides.
13. Triacontagon — 30 sides.
14. Triacontahenagon — 31 sides.
15. Triacontadigon — 32 sides.

Polygon Names for 33 to 47 Sides

For polygons beyond the familiar classroom shapes, number-based naming gives learners a practical way to connect a name directly with the shape’s side count.

1. Triacontatrigon — 33 sides.
2. Triacontatetragon — 34 sides.
3. Triacontapentagon — 35 sides.
4. Triacontahexagon — 36 sides.
5. Triacontaheptagon — 37 sides.
6. Triacontaoctagon — 38 sides.
7. Triacontaenneagon — 39 sides.
8. Tetracontagon — 40 sides.
9. Tetracontahenagon — 41 sides.
10. Tetracontadigon — 42 sides.
11. Tetracontatrigon — 43 sides.
12. Tetracontatetragon — 44 sides.
13. Tetracontapentagon — 45 sides.
14. Tetracontahexagon — 46 sides.
15. Tetracontaheptagon — 47 sides.

Polygon Names for 48 to 62 Sides

Large polygons can look increasingly circular, but their names still depend on the exact number of straight sides forming their boundary.

1. Tetracontaoctagon — 48 sides.
2. Tetracontaenneagon — 49 sides.
3. Pentacontagon — 50 sides.
4. Pentacontahenagon — 51 sides.
5. Pentacontadigon — 52 sides.
6. Pentacontatrigon — 53 sides.
7. Pentacontatetragon — 54 sides.
8. Pentacontapentagon — 55 sides.
9. Pentacontahexagon — 56 sides.
10. Pentacontaheptagon — 57 sides.
11. Pentacontaoctagon — 58 sides.
12. Pentacontaenneagon — 59 sides.
13. Hexacontagon — 60 sides.
14. Hexacontahenagon — 61 sides.
15. Hexacontadigon — 62 sides.

Polygon Names for 63 to 77 Sides

At this range, traditional terminology becomes less familiar, so understanding the underlying numerical pattern is often more important than memorizing every word.

1. Hexacontatrigon — 63 sides.
2. Hexacontatetragon — 64 sides.
3. Hexacontapentagon — 65 sides.
4. Hexacontahexagon — 66 sides.
5. Hexacontaheptagon — 67 sides.
6. Hexacontaoctagon — 68 sides.
7. Hexacontaenneagon — 69 sides.
8. Heptacontagon — 70 sides.
9. Heptacontahenagon — 71 sides.
10. Heptacontadigon — 72 sides.
11. Heptacontatrigon — 73 sides.
12. Heptacontatetragon — 74 sides.
13. Heptacontapentagon — 75 sides.
14. Heptacontahexagon — 76 sides.
15. Heptacontaheptagon — 77 sides.

Polygon Names for 78 to 92 Sides

These polygon names demonstrate how Greek-derived numerical parts can be combined to describe shapes with increasingly high side counts.

1. Heptacontaoctagon — 78 sides.
2. Heptacontaenneagon — 79 sides.
3. Octacontagon — 80 sides.
4. Octacontahenagon — 81 sides.
5. Octacontadigon — 82 sides.
6. Octacontatrigon — 83 sides.
7. Octacontatetragon — 84 sides.
8. Octacontapentagon — 85 sides.
9. Octacontahexagon — 86 sides.
10. Octacontaheptagon — 87 sides.
11. Octacontaoctagon — 88 sides.
12. Octacontaenneagon — 89 sides.
13. Enneacontagon — 90 sides.
14. Enneacontahenagon — 91 sides.
15. Enneacontadigon — 92 sides.

Polygon Names for 93 to 107 Sides

A polygon does not stop being a polygon when its side count becomes large; the same basic naming principle continues to apply.

1. Enneacontatrigon — 93 sides.
2. Enneacontatetragon — 94 sides.
3. Enneacontapentagon — 95 sides.
4. Enneacontahexagon — 96 sides.
5. Enneacontaheptagon — 97 sides.
6. Enneacontaoctagon — 98 sides.
7. Enneacontaenneagon — 99 sides.
8. Hectogon — 100 sides.
9. Hectogon Henagon — 101 sides.
10. Hectogon Digon — 102 sides.
11. Hectogon Trigon — 103 sides.
12. Hectogon Tetragon — 104 sides.
13. Hectogon Pentagon — 105 sides.
14. Hectogon Hexagon — 106 sides.
15. Hectogon Heptagon — 107 sides.

Polygon Names for 108 to 122 Sides

For very large polygons, an n-gon label is often clearer in practical mathematics than trying to memorize an uncommon traditional name.

1. Hectogon Octagon — 108 sides.
2. Hectogon Enneagon — 109 sides.
3. Decagon-Based 110-Gon — 110 sides.
4. 111-Gon — 111 sides.
5. 112-Gon — 112 sides.
6. 113-Gon — 113 sides.
7. 114-Gon — 114 sides.
8. 115-Gon — 115 sides.
9. 116-Gon — 116 sides.
10. 117-Gon — 117 sides.
11. 118-Gon — 118 sides.
12. 119-Gon — 119 sides.
13. 120-Gon — 120 sides.
14. 121-Gon — 121 sides.
15. 122-Gon — 122 sides.

Polygon Names for 123 to 137 Sides

At high side counts, number-based polygon names are straightforward labels, especially when a diagram needs to communicate the exact number quickly.

1. 123-Gon — 123 sides.
2. 124-Gon — 124 sides.
3. 125-Gon — 125 sides.
4. 126-Gon — 126 sides.
5. 127-Gon — 127 sides.
6. 128-Gon — 128 sides.
7. 129-Gon — 129 sides.
8. 130-Gon — 130 sides.
9. 131-Gon — 131 sides.
10. 132-Gon — 132 sides.
11. 133-Gon — 133 sides.
12. 134-Gon — 134 sides.
13. 135-Gon — 135 sides.
14. 136-Gon — 136 sides.
15. 137-Gon — 137 sides.

Polygon Names for 138 to 152 Sides

When studying complex geometry, keeping the numerical side count visible can be more useful than relying exclusively on specialized terminology.

1. 138-Gon — 138 sides.
2. 139-Gon — 139 sides.
3. 140-Gon — 140 sides.
4. 141-Gon — 141 sides.
5. 142-Gon — 142 sides.
6. 143-Gon — 143 sides.
7. 144-Gon — 144 sides.
8. 145-Gon — 145 sides.
9. 146-Gon — 146 sides.
10. 147-Gon — 147 sides.
11. 148-Gon — 148 sides.
12. 149-Gon — 149 sides.
13. 150-Gon — 150 sides.
14. 151-Gon — 151 sides.
15. 152-Gon — 152 sides.

Polygon Names for 153 to 167 Sides

These names are especially useful as labels for geometry diagrams, educational activities, computational models, and exercises involving large side counts.

1. 153-Gon — 153 sides.
2. 154-Gon — 154 sides.
3. 155-Gon — 155 sides.
4. 156-Gon — 156 sides.
5. 157-Gon — 157 sides.
6. 158-Gon — 158 sides.
7. 159-Gon — 159 sides.
8. 160-Gon — 160 sides.
9. 161-Gon — 161 sides.
10. 162-Gon — 162 sides.
11. 163-Gon — 163 sides.
12. 164-Gon — 164 sides.
13. 165-Gon — 165 sides.
14. 166-Gon — 166 sides.
15. 167-Gon — 167 sides.

Polygon Names for 168 to 182 Sides

As the number of sides increases, a polygon can visually resemble a circle, yet its boundary remains made from individual straight segments.

1. 168-Gon — 168 sides.
2. 169-Gon — 169 sides.
3. 170-Gon — 170 sides.
4. 171-Gon — 171 sides.
5. 172-Gon — 172 sides.
6. 173-Gon — 173 sides.
7. 174-Gon — 174 sides.
8. 175-Gon — 175 sides.
9. 176-Gon — 176 sides.
10. 177-Gon — 177 sides.
11. 178-Gon — 178 sides.
12. 179-Gon — 179 sides.
13. 180-Gon — 180 sides.
14. 181-Gon — 181 sides.
15. 182-Gon — 182 sides.

Polygon Names for 183 to 197 Sides

This final high-count group continues the same simple naming convention, making exact polygon identification easy without obscure terminology.

1. 183-Gon — 183 sides.
2. 184-Gon — 184 sides.
3. 185-Gon — 185 sides.
4. 186-Gon — 186 sides.
5. 187-Gon — 187 sides.
6. 188-Gon — 188 sides.
7. 189-Gon — 189 sides.
8. 190-Gon — 190 sides.
9. 191-Gon — 191 sides.
10. 192-Gon — 192 sides.
11. 193-Gon — 193 sides.
12. 194-Gon — 194 sides.
13. 195-Gon — 195 sides.
14. 196-Gon — 196 sides.
15. 197-Gon — 197 sides.

Polygon Names for 198 to 212 Sides

The largest names in this collection show that the basic polygon naming system can extend to virtually any finite number of straight sides.

1. 198-Gon — 198 sides.
2. 199-Gon — 199 sides.
3. 200-Gon — 200 sides.
4. 201-Gon — 201 sides.
5. 202-Gon — 202 sides.
6. 203-Gon — 203 sides.
7. 204-Gon — 204 sides.
8. 205-Gon — 205 sides.
9. 206-Gon — 206 sides.
10. 207-Gon — 207 sides.
11. 208-Gon — 208 sides.
12. 209-Gon — 209 sides.
13. 210-Gon — 210 sides.
14. 211-Gon — 211 sides.
15. 212-Gon — 212 sides.

Frequently Asked Questions About Polygon Names

What is a polygon?
A polygon is a closed, two-dimensional shape made from a finite number of straight line segments connected end to end.

What is the simplest polygon name?
A triangle is the simplest standard polygon because it has three sides. A closed polygon cannot have fewer than three sides.

What are the most common polygon names?
Triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, and decagon are among the most commonly taught polygon names.

What is a 10-sided polygon called?
A 10-sided polygon is called a decagon.

What is a 20-sided polygon called?
A 20-sided polygon is called an icosagon.

Can a polygon have hundreds of sides?
Yes. A polygon can have any finite number of sides greater than or equal to three. For large numbers, the term “n-gon” is often used.

Does a polygon with many sides become a circle?
No. Even a polygon with hundreds or thousands of sides still has straight edges. A circle has a continuous curved boundary.

What is the easiest way to identify a polygon?
Count its straight sides first. Once you know the number, match that number with the appropriate polygon name or use the corresponding n-gon label.

Conclusion

Learning polygon names becomes much easier when the naming system is connected directly to the number of sides. The familiar triangle, quadrilateral, pentagon, hexagon, and decagon are useful starting points, while the n-gon format provides a simple way to identify polygons with very large side counts.

Whether you are studying geometry, preparing classroom material, labeling diagrams, or simply trying to understand different geometric shapes, focusing on the side count gives you a reliable naming method. The key idea is simple: count the sides, identify the number, and choose the corresponding polygon name.