Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 1 - Section 1.3 - Early Definitions and Postulates - Exercises - Page 29: 13b

Answer

Either... line m is not parallel to line AD OR line t is not parallel to line AD

Work Step by Step

Non-parallel lines (in the same plane) intersect. If you extend all three lines, AD will intersect with both lines m and t. Therefore, line m is not parallel to line AD, and line AD is not parallel to line t.
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