Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 10 - Geometry - 10.6 Right Triangle Trigonometry - Exercise Set 10.6: 25

Answer

$A \approx 28^o$

Work Step by Step

RECALL: In a right triangle, $\sin{A} = \dfrac{\text{length of opposite side}}{\text{length of hypotenuse}} \\\cos{A} = \dfrac{\text{length of adjacent side}}{\text{length of hypotenuse}} \\\tan{A} = \dfrac{\text{length of opposite side}}{\text{length of adjacent side}}$ Use the cosine formula to obtain: $\cos{A} = \dfrac{\text{length of adjacent side}}{\text{length of hypotenuse}} \\\cos{A}=\dfrac{15}{17}$ Use the inverse cosine function of a scientific calculator to obtain: $A = \cos^{-1}{\frac{15}{17}} \\A = 28.07248694^o \\A \approx 28^o$
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