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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?
    • Triangle
      • A triangle has three sides.
      1 2 3
    • 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