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: 21

Answer

The measurement of side ‘a’ is \[43\text{ cm}\], measurement of side ‘c’ is\[33\text{ cm}\] and the measurement of angle B is \[38{}^\circ \].

Work Step by Step

Substitute the values in the above function as follows: \[\begin{align} & \sin \text{52}{}^\circ =\frac{a}{54} \\ & a=\sin \text{52}{}^\circ \times 54 \\ & =0.788\times 54 \\ & \approx 43 \end{align}\] It implies that: \[a\approx 43\text{ cm}\] Now, in order to compute the value of c, use the trigonometric ratio of cos A as follows: \[\cos A=\frac{\text{Side adjacent to angle }A}{\text{Hypotenuse}}\] Substitute the values in the above function as follows: \[\begin{align} & \cos \text{52}{}^\circ =\frac{b}{54} \\ & b=\cos \text{52}{}^\circ \times 54 \\ & =0.615\times 54 \\ & \approx 33 \end{align}\] It implies that: \[b\approx 33\text{ cm}\] Now, compute the third missing angle using angle sum property which specifies that sum of all angles of a triangle is equal to 180 degree. Accordingly, \[\begin{align} & m\measuredangle A+m\measuredangle B+m\measuredangle C=180{}^\circ \\ & 52{}^\circ +m\measuredangle B+90{}^\circ =180{}^\circ \\ & m\measuredangle B=180{}^\circ -90{}^\circ -52{}^\circ \\ & =38{}^\circ \end{align}\] It implies that: \[\measuredangle B=38{}^\circ \] Hence, the measurement of side denoted by ‘a’ is \[43\text{ cm}\], measurement of side denoted by ‘b’ is\[33\text{ cm}\] and the measurement of angle B is \[38{}^\circ \].
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