Geometry: Common Core (15th Edition)

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

Chapter 2 - Reasoning and Proof - Mid-Chapter Quiz - Page 105: 6

Answer

3 parallel lines that are coplanar

Work Step by Step

Parallel lines my be coplanar but cannot form a triangle, so 3 parallel lines are a counterexample to the conjecture.
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