1. Polygons by Amy Pihlainen

2. Polygons
The word polygon means “many angles”
A two dimensional object
A closed figure

3. More about 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

4. Examples of Polygons

5. These are not Polygons

6. Terms:
Side: One of the line segments that make up a polygon.
Vertex: point where two sides meet.

7. Terms continued
Interior angle: an angle formed by two adjacent sides inside the polygon.
Exterior angle: an angle formed by two adjacent sides outside the polygon.

8. Terms continued

9. 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

10. Types of Polygons continued
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

11. Examples of Regular Polygons

12. Names of Polygons
Triangle: a three sided polygon
Quadrilateral: a four sided polygon. A quadrilateral that is a regular polygon is called a square.

13. Names continued Pentagon: a five sided polygon
Hexagon: a six sided polygon
Heptagon: a seven sided polygon

14. Names continued
Octagon: an eight sided polygon
Decagon: a ten sided polygon
Dodecagon: a twelve sided polygon