Compare your answers.

 

  1. Determine the interior angles sum for

    1. a nonagon

      The polygon has 9 sides.





    2. The polygon has 11 sides.




  2. Determine the individual interior angle measures in a regular dodecagon, a 12-sided polygon.

 

For further information about solving problems involving angles in polygons see pp. 96–98 of Principles of Mathematics 11.

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