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So far we have explored the sum of the interior angles of a polygon. What about the exterior angles of a convex polygon?

Visit the Polygons: Sum of Exterior Angles website and explore the tools for triangles, quadrilaterals and pentagons.

  • What do you notice?

  • What is common about the sum of the exterior angles of all three of these polygons?

  • Do you think that your observation will be the same for other convex polygons?

Screenshot of the Polygons: Sum of Exterior Angels website

Learn more with the exterior angle of a convex polygon activity.

The Geometer’s Warehouse is full of resources to help you understand more geometric facts.