Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 8 - Application of Trigonometry - 8.1 The Law of Sines - 8.1 Exercises - Page 755: 42

Answer

$$A = 25.4^\circ ,\,\,\,B = 102.3^\circ ,\,\,\,b = 74.029{\text{yd}}$$

Work Step by Step

$$\eqalign{ & C = {\text{52}}.{\text{3}}^\circ ,a = {\text{32}}.{\text{5 yd}},c = {\text{59}}.{\text{8 yd}} \cr & {\text{Use the law of sines to find the angle of }}A \cr & \frac{{\sin A}}{a} = \frac{{\sin C}}{c} \cr & \sin A = \frac{{a\sin C}}{c} \cr & {\text{Substituting }} \cr & \sin A = \frac{{\left( {{\text{32}}.{\text{5}}} \right)\sin \left( {{\text{52}}.{\text{3}}^\circ } \right)}}{{{\text{59}}.{\text{8}}}} \cr & {\text{Use a calculator}} \cr & \sin A \approx 0.43 \cr & A \approx {\sin ^{ - 1}}\left( {0.43} \right) \cr & A \approx 25.4^\circ \cr & \cr & {\text{Calculate the angle of }}B \cr & B = 180^\circ - A - C \cr & B = 180^\circ - 25.4^\circ - {\text{52}}.{\text{3}}^\circ \cr & B = 102.3^\circ \cr & \cr & {\text{Use the law of sines to find side }}b \cr & \frac{b}{{\sin B}} = \frac{a}{{\sin A}} \cr & b = \frac{{a\sin B}}{{\sin A}} \cr & b = \frac{{{\text{32}}.{\text{5}}\sin \left( {102.3^\circ } \right)}}{{\sin \left( {25.4^\circ } \right)}} \cr & b \approx 74.029{\text{yd}} \cr} $$
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