What is a Polygon?

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What is a Polygon?

• Dr. Beth McCulloch Vinson
• Athens State University
• PT3 Grant Funding, Summer 2000

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A polygon is
a many-sided figure a shape with three or more
sides.
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What do we need to know about polygons?

• How many sides does each polygon have?
• Do all polygons look the same?
• Can I know the name of a shape just by looking at
  it?

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Triangle

• A triangle has three sides.

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3
2
5
Square

• A square has four sides.

4
3
1
2
6
Pentagon

• A pentagon has five sides.

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5
2
4
3
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Hexagon and Heptagon

• A hexagon has six sides. (Hexagon and six both
  have an x.)
• A heptagon has seven sides.

heptagon
hexagon
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Octagon

• An octagon has eight sides. Count the sides.

If this octagon was red and had the word Stop
written on it, then you would know where we see a
lot of octagons.
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Lets Review

• The triangle is the smallest polygon. It only
  has three sides.
• A pentagon has five sides.
• A hexagon has six sides.
• A heptagon has seven sides.
• An octagon has eight sides.

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Match these.

• Triangle eight sides
• Heptagon three sides
• Octagon seven sides

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Match some more.

• Pentagon four sides
• Hexagon five sides
• Square six sides

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Key Question

• A triangle is the smallest polygon because it
  has three sides. Can you have a two-sided
  polygon? Why or why not?

Two lines dont close to make a shape. They make
an angle.
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2
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The END

A Project Developed for Preparing Tomorrows
Teachers to Use Technology (PT3) By Dr. Beth
McCulloch Vinson Athens State University, School
of Education http//www.athens.edu/vinsobm