Answer
Right angle
Work Step by Step
We know the following:
$\cos\theta=\frac{u\cdot v}{|u||v|}$
Therefore, it follows:
$u\cdot v=4(1)+(3)(-1)+(-1)(1)=0$
$\theta =90\ degrees$
This is a right angle.
Linear Algebra: A Modern Introduction
by Poole, David
Published by
Cengage Learning
ISBN 10:
1285463242
ISBN 13:
978-1-28546-324-7
Chapter 1 - Vectors - 1.2 Length and Angle: The Dot Product - Exercises 1.2 - Page 290: 20
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