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Interior and Exterior Angles of Polygons

Objective: I know how to calculate the interior and exterior angles of polygons.

The formula to find the sum of the interior angles of any polygon is
sum of angles = (n - 2)180° , where n is the number of sides of the polygon.

The sum of exterior angles of any polygon is 360º.

Read the lesson on angles of a polygon for more information and examples.


Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Calculate the sum of the interior angles of the following polygons.

a 10-sided polygon
answer: °

a 12-sided polygon
answer: °

a 15-sided polygon
answer: °

an 18-sided polygon
answer: °

Find the number of sides of a regular polygon with an exterior angle of






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