Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 6 - Section 6.5 - The Law of Sines - 6.5 Exercises - Page 514: 25

Answer

No triangle satisfies the conditions given in this problem.

Work Step by Step

$a=50$ $,$ $b=100$ $,$ $\angle A=50^{\circ}$ The Law of Sines is $\dfrac{\sin A}{a}=\dfrac{\sin B}{b}=\dfrac{\sin C}{c}$ Find the angle $B$ by using the formula $\dfrac{\sin A}{a}=\dfrac{\sin B}{b}$, obtained from the Law of Sines. Substitute the known values into the formula and solve for $B$: $\dfrac{\sin50^{\circ}}{50}=\dfrac{\sin B}{100}$ $\sin B=\Big(\dfrac{100}{50}\Big)\sin50^{\circ}$ $\sin B=(2)\sin50^{\circ}$ $B=\sin^{-1}[(2)\sin50^{\circ}]=Error$ $(2)\sin50^{\circ}\approx1.532$ Since $(2)\sin50^{\circ}\approx1.532$ and the sine is never greater than $1$, no triangle satisfies the conditions given in this problem.
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