Answer
Perpendicular.
Work Step by Step
The $\bot$ shows that one line forms two 90$^{\circ}$ angles with the other. This is the definition of perpendicular.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 1 - Section 1.6 - Relationships: Perpendicular Lines - Exercises - Page 52: 19a
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