Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 9 - Polar Coordinates; Vectors - 9.4 Vectors - 9.4 Assess Your Understanding - Page 609: 101

Answer

$c^2=a^2+b^2-2ab\cdot cos(C)$, $b^2=a^2+c^2-2ac\cdot cos(B)$, $a^2=b^2+c^2-2bc\cdot cos(A)$.

Work Step by Step

$c^2=a^2+b^2-2ab\cdot cos(C)$, $b^2=a^2+c^2-2ac\cdot cos(B)$, $a^2=b^2+c^2-2bc\cdot cos(A)$.
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