Area of Regular Polygons

Day 5


  • To examine regular polygons and their area using Geometer's Sketchpad.
  • To work cooperatively in groups.
  • To use technology.

  • Warm Up Activity:

    Puzzling Pentacle

    A pentacle is a figure made up of five straight lines forming a star. As those five lines form the star, they also form a five-sided figure, called a pentagon, inside the star.

    The pentacle to the left has been put inside another pentagon, and together they form many triangles. How many triangles can you find in this perplexing puzzle?

    Click here for solution.

    Lesson Outline:

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