Glencoe Math: Course 3, Volume 2
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Glencoe Math: Course 3, Volume 2 View details
4. Polygons and Angles
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Exercise 30 Page 404

The sum of the measures of the interior angles of a polygon is where represents the number of sides.

Practice makes perfect

Let's start by recalling the rule for the sum of the measures of the interior angles of a polygon.

Interior Angle Sum of a Polygon

The sum of the measures of the interior angles of a polygon is where represents the number of sides.

To find the sum of the measures of the interior angles of an octagon, we will substitute for in this expression.
Evaluate
The sum of the interior angles of an octagon is