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 754: 28

Answer

$$B = {23.75^ \circ },\,\,a = 4099.79{\text{yd}},\,\,\,\,b = 1718.58{\text{yd}}$$

Work Step by Step

$$\eqalign{ & C = {50.15^ \circ },\,\,\,A = {106.1^ \circ }{\text{,}}\,\,\,c = 3276{\text{yd}} \cr & \cr & {\text{Find }}B \cr & B = {180^ \circ } - A - C \cr & B = {180^ \circ } - {106.1^ \circ } - {50.15^ \circ } \cr & B = {23.75^ \circ } \cr & \cr & {\text{Use the law of sines to find side }}a \cr & \frac{a}{{\sin A}} = \frac{c}{{\sin C}} \cr & a = \frac{{c\sin A}}{{\sin C}} \cr & a = \frac{{3276\sin \left( {{{106.1}^ \circ }} \right)}}{{\sin \left( {{{50.15}^ \circ }} \right)}} \cr & {\text{Use a calculator}} \cr & a = 4099.79{\text{yd}} \cr & \cr & {\text{Use the law of sines to find side }}b \cr & \frac{b}{{\sin B}} = \frac{c}{{\sin C}} \cr & b = \frac{{c\sin B}}{{\sin C}} \cr & b = \frac{{3276\sin \left( {{{23.75}^ \circ }} \right)}}{{\sin \left( {{{50.15}^ \circ }} \right)}} \cr & {\text{Use a calculator}} \cr & b = 1718.58{\text{yd}} \cr & \cr & {\text{Answer}} \cr & B = {23.75^ \circ },\,\,a = 4099.79{\text{yd}},\,\,\,\,b = 1718.58{\text{yd}} \cr} $$
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