 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.

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

a 12-sided polygon

a 15-sided polygon

an 18-sided polygon

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

45°

36°

30°

12°

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