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Interior and Exterior Angles of Polygons

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More Lessons for GCSE Maths
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Examples, solutions, and videos to help GCSE Maths students learn how to find the interior and exterior angles of polygons.

Finding the interior angles of a polygon
Geo ScreenCast 7: Polygon Angles
Using the sum of a polygon's interior angles to solve for a missing angle.



Geo ScreenCast 8: Regular Polygon Angles
Finding 1 interior angle of a regular polygon.
Example:
Find the measure of one interior angle of a regular dodecagon.
Geo ScreenCast 9: Polygon Exterior Angles
Finding an exterior angle of a regular polygon.
Example:
A regular polygon has an exterior angle that measures 40°. How many sides does the polygon have?

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