CK-12 Geometry-Concepts

http://www.ck12.org Chapter 1. Basics of Geometry

1.8 Supplementary Angles

Here you’ll learn what supplementary angles are and how they can help you to solve problems.

What if you were given two supplementary angles? How would you determine their angle measures? After
completing this Concept, you’ll be able to use the definition of supplementary angles to solve problems like this
one.

Watch This

MEDIA

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URL: http://www.ck12.org/flx/render/embeddedobject/52592

CK-12 Foundation: Chapter1SupplementaryAnglesA

MEDIA

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James Sousa: Supplementary Angles

Guidance

Two angles aresupplementarywhen they add up to 180◦. Supplementary angles do not have to be congruent or
touching.

Example A

The two angles below are supplementary. Ifm^6 MNO= 78 ◦what ism^6 PQR?