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

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter12: Angle Relationships And Transformations
Section12.2: Angles And Parallel Lines
Problem 13E
Question

Determine the measure of angle A in triangle ABC, where 

A(1, 1, 8),

 

B(4, −3, −4),

 and 

C(−3, 1, 5).
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