Let $A = (-4,0,6),$ $B = (-5,-1,2),$ and $C = (-6,-1,3).$  Compute $\angle ABC,$ in degrees.
Question:
Let $A = (-4,0,6),$ $B = (-5,-1,2),$ and $C = (-6,-1,3).$  Compute $\angle ABC,$ in degrees.
Answer:
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60^\circ
Let $A = (-4,0,6),$ $B = (-5,-1,2),$ and $C = (-6,-1,3).$  Compute $\angle ABC,$ in degrees.
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