Answer
x =60 degrees
Work Step by Step
Use the Cosine rule for the right triangle: adjacenthypotenuse
cos(x) = 5/10
Since cosine of 60 degrees is one-half:
x =60 degrees
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 10 - Radical Expressions and Equations - 10-6 Trigonometric Ratios - Practice and Problem-Solving Exercises - Page 650: 31
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