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```Polygons
Brought to you by Cavis for President
What is a Polygon????
Any ideas?
Write down what you think it is for #1.
A polygon is a closed plane figure with 3 or more sides (all
straight lines, no curves).
Classifying Polygons by # of Sides
3 sided Polygon = Triangle
Hint: Think вЂњTriвЂќcycle,
вЂњtriвЂќpod, вЂњTriвЂќlateration
(Tri means 3)
Classifying Polygons by # of Sides
(AKA 4-Wheeler)
Classifying Polygons by # of Sides
5 sided Polygon = Pentagon
Hint: Think вЂњPentвЂќathalon,
or the government building
вЂњThe PentagonвЂќ
Classifying Polygons by # of Sides
6 sided Polygon = Hexagon
Hint: Both вЂњHexagonвЂќ and
вЂњSixвЂќ have an вЂ�xвЂ™ in them
Classifying Polygons by # of Sides
7 sided Polygon = Heptagon
Hint: ???
Classifying Polygons by # of Sides
8 sided Polygon = Octagon
Hint: вЂњoctвЂќopus вЂ“ 8 legs
Classifying Polygons by # of Sides
9 sided Polygon = Nonagon
Hint: вЂњNonвЂќ is similar to
вЂњNineвЂќ
Classifying Polygons by # of Sides
10 sided Polygon = Decagon
years
Classifying Polygons by # of Sides
11 sided Polygon = Hendecagon
Hint: ???
Classifying Polygons by # of Sides
12 sided Polygon = Dodecagon
Hint: ???
Classifying Polygons by # of Sides
Q: What do we call a polygon with more than 12 sides?
A: An вЂ�nвЂ™-gon where вЂ�nвЂ™ is the number of sides
Ex: a 20 sided polygon is a 20-gon
Classifying Polygons by # of Sides
# of Sides
Name
3
Triangle
4
5
Pentagon
6
Hexagon
7
Heptagon
8
Octagon
9
Nonagon
10
Decagon
11
Hendecagon
12
Dodecagon
Two Types of Polygons
Convex вЂ“ all vertices point outward
Concave вЂ“ at least one vertex points
inward towards the center of the polygon
(The side looks like it вЂњcavedвЂќ in)
Regular Polygons
A Regular Polygon is a polygon in which all sides are the same
length.
Equilateral
Triangle пѓ пѓџ Square
Review of Similar Triangles
вЂў 2 Triangles are similar if they have the same
shape (i.e. the same angle in the same positions)
Similar Polygons
The same is true of polygons. 2 polygons are
similar if they have the same angles in the same
positions (i.e. same shape)
Similar
Trapezoids пѓ ^ Similar Pentagons ^
Similar
Rectangles пѓ ```
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