Answer
False
Work Step by Step
That line of logic only applies to triangles so it is falsely applied to the quadrilateral.
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 3 - Section 3.5 - Inequalities in a Triangle - Exercises - Page 172: 4
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