Answer
7 sides
Work Step by Step
We know that a triangle has 3 sides and that a quadrilateral by definition must have 4 sides. From this, the total number of sides would be:
$$ =3+4 \\ =7$$
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 P - Preliminary Concepts - Chapter P Review Exercises - Page 28: 10
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