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Glencoe Math: Course 3, Volume 2

GM

Glencoe Math: Course 3, Volume 2 View details

4. Polygons and Angles

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Exercise 3 Page 401

The sum of the measures of the interior angles of a polygon is (n-2)180, where n represents the number of sides.

1980^(∘)

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 (n-2)180, where n represents the number of sides.

To find the sum of the measures of the interior angles of a 13-gon, we will substitute 13 for n in this expression.

(n-2)180

n= 13

( 13-2)180

▼

Evaluate

Subtract term

(11)180

Multiply

1980

The sum of the interior angles of a 13-gon is 1980^(∘).

Subchapter links

Guided Practice p.400

Independent Practice p.401-402

H.O.T. Problems p.402

Standardized Test Practice p.402-404

Extra Practice p.403

Common Core Review p.404