Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 6 - Section 6.7 - The Dot Product - Exercise Set - Page 794: 77


The statement makes sense.

Work Step by Step

Assume vector A: $\mathbf{A}=\mathbf{i}+\mathbf{j}+\mathbf{k}$ Here i, j and k are the unit vectors with magnitude $1$. Now, consider the dot product of this unit vectors i with itself. $\begin{align} & \mathbf{i}\cdot \mathbf{i}=1\times 1\times \cos 0{}^\circ \\ & =1 \end{align}$ Thus the given statement makes sense.
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