Answer
360$^{\circ}$
Work Step by Step
The sum of the angles within a triangle is 180$^{\circ}$. Since quadrilaterals are made up of two triangles, the sum of the angles within them is 360$^{\circ}$.
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 2.4 - The Angles of a Triangle - Exercises - Page 107: 42
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