body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Glencoe Math: Course 3, Volume 2

GM

Glencoe Math: Course 3, Volume 2 View details

4. Polygons and Angles

Continue to next subchapter

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.

$198 0^{\circ}$

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

198 0^{\circ} .

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