how many sides does a polygon have

A polygon can have any number of sides 3 or greater : 3, 4, 5, 6… all the way up to very large numbers.

Quick Scoop

Core idea: what is a polygon?

• A polygon is a flat shape made of straight line segments joined end to end, forming a closed loop.

• Each straight segment is called a side , and a polygon always has the same number of sides and interior angles.

So how many sides does a polygon have?

• There is no single fixed number:
  • 3 sides → triangle
  • 4 sides → quadrilateral
  • 5 sides → pentagon
  • 6 sides → hexagon
  • 7 sides → heptagon
  • 8 sides → octagon, etc.

• In general, a polygon with nnn sides is just called an n‑gon (like “20‑gon” for 20 sides).

Mini fact: interior angles and sides

• The sum of the interior angles of an n‑sided polygon is (n−2)×180(n-2)×180(n−2)×180 degrees.

• This formula lets you work backwards: if you know the total angle sum, you can solve for how many sides the polygon has.

Small name table (HTML)

Here’s a quick reference for common polygons:

html

<table>
  <tr><th>Number of sides</th><th>Name of polygon</th></tr>
  <tr><td>3</td><td>Triangle</td></tr>
  <tr><td>4</td><td>Quadrilateral</td></tr>
  <tr><td>5</td><td>Pentagon</td></tr>
  <tr><td>6</td><td>Hexagon</td></tr>
  <tr><td>7</td><td>Heptagon</td></tr>
  <tr><td>8</td><td>Octagon</td></tr>
  <tr><td>9</td><td>Nonagon (Enneagon)</td></tr>
  <tr><td>10</td><td>Decagon</td></tr>
</table>

In forum-style discussions, people sometimes ask “how many sides does a polygon have?” and the usual answer is: “as many as you like, as long as it’s at least three.”

TL;DR: A polygon is any closed shape made of straight segments and can have 3 or more sides ; there is no upper limit in theory.

Information gathered from public forums or data available on the internet and portrayed here.