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What is a polygon?

What is a polygon?

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Polygonspowerpoint Polygonspowerpoint Presentation Transcript

  • What is a Polygon? Dr. Beth McCulloch Vinson Athens State University PT3 Grant Funding, Summer 2000
  • a many-sided figure a shape with three or more sides. A polygon is…
  • 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?
    View slide
  • Triangle
    • A triangle has three sides.
    1 2 3 View slide
  • Square
    • A square has four sides.
    1 2 3 4
  • Pentagon
    • A pentagon has five sides.
    1 2 3 4 5
  • Hexagon and Heptagon
    • A hexagon has six sides. (Hexagon and six both have an “x”.)
    • A heptagon has seven sides.
    hexagon heptagon
  • 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
    • 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. 2 1 Key Question:
  • 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