Answer
Sine ratio, $α \approx 49^{\circ}$
Work Step by Step
$sin = \frac{opposite}{hypotenuse}$
$sin(α) = \frac{9}{12}$ (Sine ratio)
by GDC / calculator
$α = 48.5903...^{\circ}$
$α \approx 49^{\circ}$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 11 - Review Exercises - Page 532: 7
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