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**Brought to you by Cavis for President**

Polygons Brought to you by Cavis for President

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**What is a Polygon???? Any ideas?**

Write down what you think it is for #1.

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**A polygon is a closed plane figure with 3 or more sides (all straight lines, no curves).**

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**Classifying Polygons by # of Sides**

3 sided Polygon = Triangle Hint: Think “Tri”cycle, “tri”pod, “Tri”lateration (Tri means 3)

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**Classifying Polygons by # of Sides**

4 sided Polygon = Quadrilateral Hint: Think “Quad”rant, “Quad”ruple, “Quad” (AKA 4-Wheeler)

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**Classifying Polygons by # of Sides**

5 sided Polygon = Pentagon Hint: Think “Pent”athalon, or the government building “The Pentagon”

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**Classifying Polygons by # of Sides**

6 sided Polygon = Hexagon Hint: Both “Hexagon” and “Six” have an ‘x’ in them

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**Classifying Polygons by # of Sides**

7 sided Polygon = Heptagon Hint: ???

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**Classifying Polygons by # of Sides**

8 sided Polygon = Octagon Hint: “oct”opus – 8 legs

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**Classifying Polygons by # of Sides**

9 sided Polygon = Nonagon Hint: “Non” is similar to “Nine”

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**Classifying Polygons by # of Sides**

10 sided Polygon = Decagon Hint: Think “Dec”ade (10 years

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**Classifying Polygons by # of Sides**

11 sided Polygon = Hendecagon Hint: ???

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**Classifying Polygons by # of Sides**

12 sided Polygon = Dodecagon Hint: ???

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**Classifying Polygons by # of Sides**

Q: What do we call a polygon with more than 12 sides? A: An ‘n’-gon where ‘n’ is the number of sides Ex: a 20 sided polygon is a 20-gon

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**Classifying Polygons by # of Sides**

Name 3 Triangle 4 Quadrilateral 5 Pentagon 6 Hexagon 7 Heptagon 8 Octagon 9 Nonagon 10 Decagon 11 Hendecagon 12 Dodecagon

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**Two Types of Polygons Convex – all vertices point outward**

Concave – at least one vertex points inward towards the center of the polygon (The side looks like it “caved” in)

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**A Regular Polygon is a polygon in which all sides are the same length.**

Regular Polygons A Regular Polygon is a polygon in which all sides are the same length. Equilateral Triangle Square

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**Review of Similar Triangles**

• 2 Triangles are similar if they have the same shape (i.e. the same angle in the same positions)

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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 ^ Similar Pentagons ^ Similar Rectangles

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