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

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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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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 Pentagons ^ Similar Trapezoids Similar Rectangles

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