Answer
260$^{\circ}$
Work Step by Step
.5(AB+CD)=m$\angle$CED
AB+CD=100
AC+BD=360-AB+CD
AC+BD=360-100
AC+BD=260$^{\circ}$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 6 - Review Exercises - Page 319: 23f
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