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Interior Angles
See It in Action
Two examples of the idea done right—and one common look-alike that is not right.
EXAMPLE
EXAMPLE
NON-EXAMPLE
Definition
Interior Angle of a Polygon: An interior angle is the angle formed inside a polygon where two adjacent sides meet at a vertex.
Key points:
Every vertex of a polygon has one interior angle.
An interior angle and its adjacent exterior angle are a linear pair and add to 180°.
The sum of the interior angles of a polygon with n sides is (n - 2) • 180°.
In a regular polygon, each interior angle can be found by dividing the sum by n.
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