Chapter 1-6 (Classify Polygons)
 What is a polygon?
 A closed plane figure
formed by 3 or more line
segments, with no two
sides being collinear.
Chapter 1-6 (Classify Polygons)
 Two types of polygons
 Convex: All vertices
going outward
 Concave: A vertex going
inside the polygon
Chapter 1-6 (Classify Polygons)
 Example
 Tell whether the
following polygons are
convex or concave
Chapter 1-6 (Classify Polygons)
 How do you classify
polygons?
 Named by the number of
sides
 After 12 sides, the
general name is a n-gon,
where n is the number of
sides
 Congruent polygons:
 Equilateral: All sides are
congruent
 Equiangular: All angles
are congruent
 Regular: Convex polygon
that is both
Chapter 1-6 (Classify Polygons)
 Example
 Classify the polygons by
the number of sides. Is it
equilateral, equiangular,
or regular?
Chapter 1-6 (Classify Polygons)
 Example
Chapter 1-6 (Classify Polygons)
 Example
 The expression (4x + 8)º
and (5x – 5)º represent
the measures of 2 of the
congruent angles in the
previous problem. Find
the measure the an
angle.