### Polygons

```Polygons
The word
‘polygon’ is a
Greek word.
Poly means
many and
gon means
angles.
Polygons
• The word polygon
means “many angles”
• A two dimensional
object
• A closed figure
Polygons
• Made up of three or more
straight line segments
• There are exactly two sides
that meet at a vertex
• The sides do not cross each
other
Polygons
Examples of Polygons
Polygons
These are not Polygons
Polygons
Terminology
Side: One of the line
segments that make up a
polygon.
Vertex: Point where two
sides meet.
Polygons
Vertex
Side
Polygons
• Interior angle: An angle
formed by two adjacent
sides inside the polygon.
• Exterior angle: An angle
formed by two adjacent
sides outside the polygon.
Polygons
Exterior angle
Interior angle
Polygons
Let us review
Exterior angle
Vertex
Side
Interior angle
Polygons
Types of Polygons
• Equiangular Polygon: a
polygon in which all of the
angles are equal
• Equilateral Polygon: a
polygon in which all of the
sides are the same length
Polygons
• Regular Polygon: a
polygon where all the
angles are equal and all
of the sides are the same
length. They are both
equilateral and
equiangular
Polygons
Examples of Regular Polygons
Polygons
```