Lesson 9-5
Objective - To use classify polygons.
Parts of a polygon.
What is a polygon?
Polygon - A closed figure made up of line segments.
Vertex
Examples.
Side
Regular Polygon - Polygon with all sides congruent
and all angles congruent.
Polygons
Circle the polygons below.
Regular Polygon - Polygon with all sides congruent
and all angles congruent.
Polygons
# of sides
Name
9
Nonagon
10
Decagon
Regular Polygons
Drawing
Drawing
Name
Regular Polygons
Drawing
Drawing
# of sides
Name
3
Triangle
Name
Acute
Equilateral
4
Quadrilateral
Square
5
Pentagon
Regular
Pentagon
6
Hexagon
Regular
Hexagon
7
Heptagon
8
Octagon
Regular
Octagon
Name each polygon and tell if it is regular or
not regular.
1.
Regular
Decagon
2
2.
regular
pentagon
4.
not regular
g
5
5.
quadrilateral
regular
octagon
regular
g
triangle
6.
3.
not regular
octagon
not regular
triangle
Math 6 Slide Show: Teaching Made Easy As Pi, by Mike Mills and James Wenk © 2011