Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 6 - Review Exercises: 24j

Answer

3

Work Step by Step

We use the theorems in the chapter to obtain: $6^2 = (CD)(9+CD) \\ CD^2 +9CD - 36 = 0 \\ (CD +12)(CD-3) = 0 \\ CD =3$ Note, CD cannot be negative.
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