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9-83.

Review what you know about the angles of polygons below. 

  1. If the exterior angle of a polygon is , what is the interior angle?

  2. If the interior angle of a polygon is , can it be a regular polygon? Why or why not?

    Yes, a regular -gon has interior angles of .

  3. Determine the sum of the interior angles of a regular ‑gon.

    sum of the interior angles