#21 Tridecagon

While teaching an enrichment lesson to 3rd graders a few weeks ago, one of them asked what a 13-sided figure was called.  Did you know it is a called a TRIDECAGON? Explore polygons and polygon names in this math mini spark.

Spark your math thinking!

1. Set up your math mini spark recording page: #21 Tridecagon

Choose 2 activities to complete this mini spark

  • Watch The Greedy Triangle by Marilyn Burns.  Reading this book aloud is my  favorite ways to start a geometry unit.  After watching the video, make a recording on your recording page about your favorite shape and where it appears most often. Pick a polygon and draw 4-5 pictures of where that shape appears.
  • At Math is Fun, research the names of polygons that you don’t already know and create a visual showing what you have learned.
  • Create a “Geometry Around Us Presentation.”  Look at this example: https://youtu.be/aDcRaVMiTa8 as a starting point.  You can use any tool (Explain Everything, Pic Collage, Canva, etc.) and include as many vocabulary words as you like.  Try to find pictures of polygons in your school or outside.
  • Write your name in block polygon letters.  Color the letters and under each one, write the correct name for each polygon.

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2. Share your math mini spark recording page with your teacher/EY coordinator.


7 thoughts on “#21 Tridecagon

  1. After watching the greedy triangle I have come to the conclusion that the Octagon is my favorite shape because my birthday is in October. The octagon appears most on stop signs.

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