Answer
If the angles formed by lines l and m are right angles, then these lines are perpendicular.
Work Step by Step
This is a condensed contrapositive of the given statement.
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 2 - Section 2.2 - Indirect Proof - Exercises - Page 94: 18
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