Calculus 3: Vector Calculus in 3-D (11 of 35) Dot Product in 3-D: Find thetha=?

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In this video I will find the dot product=? of A=7i+3j+5k and B=-8i+4j+2k, and the angle between vector=? A and B.

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why we don't get the 3 rd quadrant angles as our answer

virunanadun
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i take that these two are position vectors, otherwise there should be two possible answers according to the way they intersect. How can we tell if a given vector is position vector or a displacement vector.

kina