Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 7 - Section 7.6 - Vectors: The Dot Product - 7.6 Problem Set - Page 411: 23

Answer

$90^\circ$.

Work Step by Step

From what we learned: $\cos\theta=\frac{U\cdot V}{|U||V|}=\frac{13\cdot0+0\cdot(-6)}{\sqrt{13^2+0^2}\sqrt{0^2+(-6)^2}}=\frac{0}{13\cdot6}=0$ Thus $\theta=\cos^{-1}0=90^\circ$.
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