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# Relation of Polygon Sides to Angles and Diagonals

## Use the formula (x - 2)180 to find the sum of the interior angles of any polygon.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Relation of Polygon Sides to Angles and Diagonals

Discover how to find interior angle measures of polygons by drawing diagonals to create triangles.
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• Video

## Sum of Interior Angles of a Polygon

by CK-12 //basic
Shows a generalized way to find the sum of the interior angles of any polygon.
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• 2

## Angle Activities

by Kyle Bardman //basic
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## Angle Activities

by Isha //basic
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• Flashcards

## Relation of Polygon Sides to Angles and Diagonals

by Tiffany Kwok //basic