# Polygon

## Polygon

• A polygon can also be defined as a closed polygonal chain.
• The point where two sides meet is the vertex of the polygon.
• Each line segment that joins two vertices is a side of the polygon.

The polygons listed below are named according to their number of sides:

• 3 sides: triangle
• 5 sides: pentagon
• 6 sides: hexagon
• 7 sides: heptagon
• 8 sides: octagon
• 9 sides: nonagon
• 10 sides: decagon
• 11 sides: hendecagon
• 12 sides: dodecagon
• 20 sides: icosagon
• 30 sides: triacontagon
• 50 sides: pentacontagon
• 100 sides: hectagon
• 1000 sides: chiliagon
• 10 000 sides: myriagon

### Examples

This polygon has 4 vertices and 4 sides :

The closed polygonal chains below form various types of polygons: