Answer
Perpendicular
Work Step by Step
Slope of AB:
$m=\frac{11-3}{-4--8}$
$m=2$
Slope of CD:
$m=\frac{3-2}{-1-1}$
$m=-\frac{1}{2}$
Because $-\frac{1}{2}$ is the negative recipricol of 2, lines AB and CD are perpendicular.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 3 - Parallel and Perpendicular Lines - 3-8 Slopes of Parallel and Perpendicular Lines - Lesson Check - Page 201: 1
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