9'6 Polygons

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9.6 Polygons
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What is a polygon?
A polygon is a closed plane figure that is formed
by 3 or more segments called sides.
These are NOT considered polygons!
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Classifying Polygons
These ARE polygons!
Any 3 sided figure is called a TRIANGLE.
Any 5 sided shape is called a PENTAGON.
Any 6 sided shape is called a HEXAGON.
Any 4 sided figure is called a QUADRILATERAL.
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Classifying Polygons Continued
Any 7 sided figure is called a HEPTAGON.
Any 8 sided figure is called an OCTAGON.
Any 9 sided shape is called a NONAGON.
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Regular Polygons
A regular polygon is a polygon with equal side
lengths and equal angle measures.
squares are always regular
regular hexagon
regular pentagon
These polygons are considered regular because all
sides and angles are equal.
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Diagonals
A diagonal of a polygon is a segment, other than
a side, that connects 2 vertices of a side.
5 diagonals
3 diagonals
2 diagonals
Remember You count the diagonals from 1 vertex.
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Now You Try!
Name the following polygons.
Octagon8 sides
Heptagon7 sides
Hexagon6 sides
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Now You Try Continued.
Tell how many diagonals that can be drawn from
each polygon.
5 diagonals
6 diagonals
2 diagonals