Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 5 - Review Exercises - Page 274: 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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