1. POLYGONS

2. What is a Polygon? A closed figure made by joining line segments, where each line segment intersects exactly two others Examples of polygons:

3. What is Not a Polygon This figure is not a polygon because it is not a closed figure.

4. What is Not a Polygon This figure is not a polygon because it is not made of line segments.

5. What is Not a Polygon This figure is not a polygon because its sides do not intersect in exactly two places each.

6. How is a Polygon classified? By the number of sides it has

7. Types of Polygons Triangle Quadrilateral Pentagon Hexagon Has three sides Has four sides Has five sides Has six sides

8. Types of Polygons Heptagon Octagon Nonagon Decagon Has seven sides Has eight sides Has nine sides Has ten sides

9. More About Polygons You can describe a polygon by comparing: The lengths of its sides OR The measures of its angles

10. Describing Polygons Equilateral Equiangular Regular All the sides of the polygon are congruent All the angles of the polygon are congruent The polygon is both equilateral and equiangular