What is a Polygon?

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# What is a Polygon? - PowerPoint PPT Presentation

What is a Polygon?. Dr. Beth McCulloch Vinson Athens State University PT3 Grant Funding, Summer 2000. A polygon is…. a many-sided figure a shape with three or more sides. What do we need to know about polygons?. How many sides does each polygon have? Do all polygons look the same?

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### What is a Polygon?

Dr. Beth McCulloch Vinson

Athens State University

PT3 Grant Funding, Summer 2000

A polygon is…

a many-sided figure

a shape with three or more sides.

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?
Triangle
• A triangle has three sides.

1

3

2

Square
• A square has four sides.

4

3

1

2

Pentagon
• A pentagon has five sides.

1

5

2

4

3

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

heptagon

hexagon

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.

Let’s 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.
Match these.

Triangle eight sides

Heptagon three sides

Octagon seven sides

Match some more.

Pentagon four sides

Hexagon five sides

Square six sides

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 don’t close to make a shape. They make an angle.

1

2

The END

A Project Developed for

Preparing Tomorrow’s Teachers to Use Technology (PT3)

By Dr. Beth McCulloch Vinson

Athens State University, School of Education

http://www.athens.edu/vinsobm