Geometry: Common Core (15th Edition)

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

Chapter 2 - Reasoning and Proof - 2-3 Biconditionals and Definitions - Lesson Check - Page 101: 6


"A linear pair is a pair of adjacent angles with noncommon sides that are opposite rays" is the better definition because it is precise and reversible.

Work Step by Step

The first definition is not precise, because it does not say the angles must be adjacent. It is also not reversible, because there are supplementary angles that do not form a linear pair.
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