Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 10 - Radical Expressions and Equations - 10-6 Trigonometric Ratios - Practice and Problem-Solving Exercises - Page 638: 31


x = 60

Work Step by Step

Use the Cosine rule for the right triangle: $\frac{adjacent}{hypotenuse}$ cos(x) = $\frac{5}{10}$ SImplify the above equation: x = 60 degrees Since cosine of 60 degrees is half: x =60 degrees
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