Answer
$${{\text{acute}}}$$
Work Step by Step
$$\eqalign{
& {\text{If the dot product of two vectors is a positive number}},{\text{ then the}} \cr
& {\text{angle between them is }}\underline {{\text{acute}}} \cr} $$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 8 - Application of Trigonometry - 8.4 Algebraically Defined Vectors and the Dot Product - 8.4 Exercises - Page 789: 8
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