?Determine the measure of angle A in triangle ABC, where A(1, 1, 8), B(4, ?3, ?4), and
Chapter 2, Problem 153(choose chapter or problem)
Determine the measure of angle A in triangle ABC, where A(1, 1, 8), B(4, −3, −4), and C(−3, 1, 5). Express your answer in degrees rounded to two decimal places.
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