Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 5 - Review Exercises - Page 263: 31b



Work Step by Step

$\frac{AD+DC}{BC}$=$\frac{BC}{DC}$ $\frac{AD+5}{15}$=$\frac{15}{5}$ AD+5=45 AD=40
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