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 - Page 666: 27

Answer

The measure of length\[x\]is\[653\text{ units}\].

Work Step by Step

The trigonometric ratio for \[\text{Tangent }A\]will be determined by dividing the opposite side of angle A with the adjacent side of the triangle. In order to determine the length of\[x\], firstly compute the length of BC using the equation as shown below: In\[\vartriangle ABC\], we have \[\begin{align} & \text{tan }A=\frac{\text{Opposite side of angle }A}{\text{Adjacent side of angle }A} \\ & =\frac{BC}{AC} \\ & \text{tan 40}{}^\circ =\frac{BC}{500} \end{align}\] \[\begin{align} & BC=\tan \text{ 40}{}^\circ \times 500 \\ & =0.8395\times 500 \\ & \approx 420\,unit \end{align}\] Now, compute the length of the \[CD\]using the equation as shown below: In\[\vartriangle ACD\], we have \[\begin{align} & \text{tan }A=\frac{\text{Opposite side of angle }A}{\text{Adjacent side of angle }A} \\ & =\frac{CD}{AC} \\ & \text{tan 25}{}^\circ =\frac{CD}{500} \end{align}\] \[\begin{align} & CD=\tan \text{ 25}{}^\circ \times 500 \\ & =0.4665\times 500 \\ & \approx 233\,unit \end{align}\] Now, as per the given figure \[\begin{align} & x=BD \\ & =BC+CD \\ & =420\,units+233\,units \\ & =653\,units \end{align}\] Hence, the measure of length \[x\]is\[653\text{ units}\].
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