Geometry: Common Core (15th Edition)

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

Chapter 8 - Right Triangles and Trigonometry - 8-3 Trigonometry - Practice and Problem-Solving Exercises - Page 511: 24

Answer

46

Work Step by Step

9= adjacent angle 13= hypotenuse x= reference angle tan= adj/ hyp $x =cos^{-1}(9/13)$ x= 46
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