Definition
Definition Polygon
A polygon is a plane figure that is formed by three or more segments called sides, such that no two sides with a common endpoint are collinear, and each side intersects exactly two other sides, one at each endpoint. Each endpoint is called a vertex of the polygon
Examples of Polygons
1.6 Classify Polygons
No: All sides must be straight
Yes
No: All sides must be straight
Names
Names Polygon Names
A polygons name depends on the number of sides it has
# of Sides Name
3 Triangle
4 Quadrilateral
5 Pentagon
6 Hexagon
7 Heptagon
# of Sides Name
8 Octagon
9 Nonagon
10 Decagon
12 Dodecagon
N N-gon
Descriptions
Descriptions Describing Polygons
A polygons description depends on its shape
Convex: No line that contains a side of the polygon contains a point in the interior of the polygon
Non-Convex/Concave: A polygon that is not convex
Examples
Hexagon Concave
Heptagon
Convex
Heptagon
Concave
Heptagon
BCDEFGA DEFGABC
Homework #7P. 44: 1-10, 14-21, 24, 25, 32-40, 43-53 odd
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