1. Chapter 1 – Essentials of Geometry
1.6 CLASSIFY POLYGONS
Chapter 1 – Essentials of Geometry

2. Polygon means having many angles. We often think of
Identifying Polygons
Polygon means having many
angles. We often think of
polygons by their many sides.

3. Attributes of a Polygon
Each adjacent side meet at an endpoint
No two adjacent sides, with a common endpoint, are collinear
Sides are always straight segments (no curves)
Figure is always “closed”

4. Type of Polygon
Convex
Nonconvex (concave)

5. Parts of a Polygon Vertices Interior/Exterior
Interior angles/Exterior angles
Diagonals
Perimeter
Area

6. Special Polygons Equilateral Equiangular Regular All sides congruent
All angles congruent
All sides AND all angles congruent

7. Names of Polygons 3 4 5 6 7 8 9 10 12 n Triangle Quadrilateral
Pentagon
Hexagon
Heptagon
Octagon
Nonagon
Decagon
Dodecagon
n-gon