# Geometry 1.6 Classify Polygons by aku11392

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```									Geometry 1.6 Classify
Polygons
Notetaking Guide pages 21 – 23
12 8
Definition of Polygon
   A polygon is a closed figure formed by a finite
number of coplanar segments such that:
   1. the sides that have a common endpoint are
non-collinear, and
   2. each side intersects exactly two other sides,
but only at their endpoints
Definition of a Regular Polygon
   A regular polygon is a convex polygon with all
sides congruent and all angles congruent.
   Only convex polygons can be regular.
Polygons are classified by number of
sides.
   3 sides    triangle
   5 sides    pentagon
   6 sides    hexagon
   7 sides    heptagon
   8 sides    octagon
   9 sides    nonagon
   10 sides   decagon
   12 sides   dodecdagon
   n sides    n-gon
Other Vocabulary
   Convex – no line that contains a side of the
polygon contains a point in the interior of the
polygon
   Concave – a polygon that is not convex
   n-gon – a polygon with n sides
   Equilateral – all sides are congruent
   Equiangular – all angles in the interior of the
polygon are congruent
polygon
   Notetaking Guide pages 22-23

sides
two
collinear
vertex
not a polygon
a convex polygon
a concave polygon

convex polygon           not a polygon
8
regular octagon
congruent
4x + 3 5x – 1
4    x

4              4   19
19

60°
Summary
TAKS REVIEW
   A function f(x) = -2x2 – 5 has
{-37, -7, -13, -23} as the replacement set for
the dependent variable. Which of the
following contained in the corresponding set
for the independent variable?
a. -343      b. -103        c. -6      d. 1
TAKS REVIEW
REMEMBER
UNITS OF AREA ARE SQUARED
UNITS OF VOLUME ARE CUBED

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