Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 7 - Similarity - Mid-Chapter Quiz - Page 459: 2


$\frac{a}{9} = \frac{b}{10}$

Work Step by Step

One of the properties of proportions is that we can switch the means, and the resulting proportion would be equivalent to the original proportion. In this exercise, $b$ and $9$ are the means, so we can switch these values: $\frac{a}{9} = \frac{b}{10}$
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