## LESSON: Classifying Polygons

### Objectives/Vocab

## Objectives

- Classify polygons.
- Distinguish between regular and irregular polygons.
- Relate sides of polygons to the sum of the interior angles.
- Relate sides of polygons to the number of diagonals form a vertex.

### Vocabulary

- Polygon
- A simple closed figure formed by three or more line segments.

- Pentagon
- five sided polygon

- Hexagon
- six sided polygon

- Heptagon
- seven sided polygon

- Octagon
- eight sided polygon

- Nonagon
- nine sided polygon

- Decagon
- ten sided polygon

- Regular Polygon
- polygon with all sides congruent

- Irregular Polygon
- a polygon where all of the side lengths are not congruent

- Congruent
- exactly the same or equal

- Diagonal
- a line segment in a polygon that connects nonconsecutive vertices

- Nonconsecutive
- not next to each other