Elementary Geometry for College Students (5th Edition)

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

Chapter 1 - Section 1.6 - Relationships: Perpendicular Lines - Exercises: 19a



Work Step by Step

The $\bot$ shows that one line forms two 90$^{\circ}$ angles with the other. This is the definition of perpendicular.
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