CK-12 Geometry-Concepts

1.6. Angle Classification http://www.ck12.org

1.6 Angle Classification

Here you’ll learn how to classify angles based on their measure.

What if you wanted to group different angles into different categories? After completing this Concept, you’ll be able
to classify angles geometrically.

Watch This

MEDIA

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URL: http://www.ck12.org/flx/render/embeddedobject/52596

CK-12 Foundation: Chapter1AngleClassificationA

MEDIA

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URL: http://www.ck12.org/flx/render/embeddedobject/1275

James Sousa: Animation of Types of Angles

Guidance

By looking at the protractor we measure angles from 0◦to 180◦. Angles can be classified, or grouped, into four
different categories.

Straight Angle:When an angle measures 180◦. The angle measure of a straight line. The rays that form this angle
are called opposite rays.

Right Angle:When an angle measures 90◦.