Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - 1-4 Measuring Angles - Practice and Problem-Solving Exercises - Page 33: 40

Answer

Angle Addition Postulate

Work Step by Step

The diagram shows that sum of the measures of the two smaller angles formed by the ray always equals the sum of the larger angle.
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