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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?

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what is a polygon

What is a Polygon?

Dr. Beth McCulloch Vinson

Athens State University

PT3 Grant Funding, Summer 2000

slide2

A polygon is…

a many-sided figure

a shape with three or more sides.

what do we need to know about polygons
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
Triangle
  • A triangle has three sides.

1

3

2

square
Square
  • A square has four sides.

4

3

1

2

pentagon
Pentagon
  • A pentagon has five sides.

1

5

2

4

3

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

heptagon

hexagon

octagon
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
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
Match these.

Triangle eight sides

Heptagon three sides

Octagon seven sides

match some more
Match some more.

Pentagon four sides

Hexagon five sides

Square six sides

slide12

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
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