Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapters 1-6 - Cumulative Test - Page 358: 8

Answer

$x = 17$ and $y= 15$

Work Step by Step

1. Find the angles in $\bigtriangleup DBC$ $\angle BDC = 55˚$ (Given) $\angle DCB = 90˚$ (Right angle triangle) $\angle CBD = 180 - (55 + 90)$ $= 180 - 145$ $= 35˚$ 2. Find the angles in $\bigtriangleup ADB$ $\angle A = 38˚$ $\angle ADB = 180 - 55$ $= 125˚$ $\angle DBA = 180 - (125 + 38)$ $= 180 - 163$ $= 17˚$ 3. Find $y$ $\frac{y}{sin(\angle DBA)} = \frac{41}{sin(\angle ADB)}$ $\frac{y}{sin(17)} = \frac{41}{sin(125)}$ $y = \frac{41sin(17)}{sin(125)}$ by GDC / calculator $y = 14.6337$ units $y = 15$ units 4. Find $x$ $\frac{x}{sin(\angle CBD)} = \frac{DB}{sin(90)}$ $\frac{x}{sin(\angle CBD)} = \frac{29}{1}$ $\frac{x}{sin(35)} = 29$ $x = 29sin(35)$ by GDC / calculator $x = 16.6337...$ units $x = 17$ units Therefore, $x = 17$ and $y= 15$
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