Polygon Angle Sum

Using patterns to build a formula is an important mathematical skill. Pupils discover a formula to find the sum of interior angles in a polygon by analyzing a pattern. The additional videos show how to use the formula to find various unknowns.

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CCSS: Adaptable
Instructional Ideas

  • Pause the video so classes can determine the pattern between the number of sides, triangles, and angle sum; ask them to create a formula using that pattern
Classroom Considerations

  • Requires Internet connection and class computer to view the video
  • Pupils must be able to use formulas and solve for an unkown
Pros

  • Shows all steps when using the formulas; pupils can easily follow along and take notes
Cons

  • Does not give examples of real-life application or context
Common Core