Dot Product For An Angle

Geometry Level 2

Three points A,B,A, B, and CC in three-dimensional Euclidean space have their respective coordinates (6,2,4),(1,1,2), (-6, 2, -4), (-1, 1, -2), and (2,2,1).(-2, 2, 1). What is the measure of ABC?\angle ABC?

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