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: 46a

Answer

9.7

Work Step by Step

We see that the value of "a" is 3. Thus, we use trigonometry to find: $cos72^{\circ}=\frac{3}{l} \\ l = \frac{3}{cos72^{\circ}} = 9.7$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.