Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 11 - Section 11.1 - The Sine Ratio and Applications - Exercises - Page 496: 21


$\alpha=29^{\circ}$ $\beta=61^{\circ}$

Work Step by Step

$\sin\alpha=\frac{12}{25}$ $\alpha=\sin^{-1}\frac{12}{25}$ $\alpha\approx29^{\circ}$ Sum of interior angles of a triangle $= 180^{\circ}$ $90^{\circ} + \alpha + \beta = 180^{\circ}$ $90^{\circ} + 29^{\circ} + \beta \approx 180^{\circ}$ $\beta\approx61^{\circ}$
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