Sum of Interior Angles of a Polygon

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• Arquivo GeoGebra

  1. Move triangle vertices A, B. and C. Notice how this changes exterior angle Y and interior angle X. (.ggb)
     
  2. Applet 2 (.ggb)
     
  3. Observe this Quadrilateral (.ggb)
     
  4. Move the vertices A, B, C, and D around and observe what happens to the degree measurements. (.ggb)
     
  5. This is a polygon with FIVE sides. Start at vertex C, use the line segment feature to draw as many triangles as you can that are attached to the other vertices of the polygon. (.ggb)
     
  6. Start at vertex B, use the line segment feature to draw as many triangles as you can that are attached to the other vertices of the polygon. (.ggb)
     
  7. Start at vertex F, use the line segment feature to draw as many triangles as you can that are attached to the other vertices of the polygon. (.ggb)