Given u = −3i + 5j and v = −24i + 40j, are u and v parallel or orthogonal? Explain.  a The vectors are orthogonal because cos θ = 1.  b The vectors are orthogonal because u ⋅ v = 0.  c The vectors are parallel because cos θ = 1.  d The vectors are parallel because u ⋅ v = 0.

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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Given u = −3i + 5j and v = −24i + 40j, are u and v parallel or orthogonal? Explain.

 a

The vectors are orthogonal because cos θ = 1.

 b

The vectors are orthogonal because u  v = 0.

 c

The vectors are parallel because cos θ = 1.

 d

The vectors are parallel because u  v = 0.

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