Elementary Geometry for College Students (5th Edition)

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

Chapter 11 - Section 11.3 - The Tangent Ratio and Other Ratios - Exercises - Page 519: 47a

Answer

9.2

Work Step by Step

We see that the value of "a" is 3. Thus, we use trigonometry to find: $tan72^{\circ}=\frac{h}{h3} \\ h = 3tan72^{\circ} =9.2 $
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