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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 25 Page 403

In a polygon, the sum of the measures of the exterior angles — one at each vertex — is $36 0^{\circ} .$

$2 0^{\circ}$

Practice makes perfect

To find the measure of an exterior angle of a regular $18 -$ gon, we will first recall an important piece of information.

Exterior Angles of a Polygon
In a polygon, the sum of the measures of the exterior angles — one at each vertex — is $36 0^{\circ} .$

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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