Question
Let a, b, and c be unit vectors, such that a+b+c=0. Show that the angle between any two of these vectors is 120 degrees.
I proved this geometrically, but now my teacher wants a proof using vectors, and I don't know what to do.
I proved this geometrically, but now my teacher wants a proof using vectors, and I don't know what to do.
Answers
112
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