Determine the measure of angle A in triangle ABC, where vector A(1, 1, 8), vector B(4, −3, −4), and vector C(−3, 1, 5).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter8: Applications Of Trigonometry
Section8.4: The Dot Product
Problem 24E
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Determine the measure of angle A in triangle ABC, where vector A(1, 1, 8), vector B(4, −3, −4), and vector C(−3, 1, 5).

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