## Elementary Geometry for College Students (7th Edition)

Published by Cengage

# Chapter 6 - Review Exercises - Page 315: 23f

#### 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$^{\circ}$

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