Vectors - determining ##\angle abc##

Thread starter angela107
Start date Jun 4, 2020
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Vectors

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SUMMARY

The discussion centers on the calculation of vectors, specifically the vector ##\vec{BC}=[-4,0,0]##, where a minus sign was identified as a critical factor in the calculation. The correct approach involves using the vector ##\vec{BA}## instead of ##\vec{AB}##, which aligns with the convention that defines ##\vec{AB} = \vec{B} - \vec{A}##. This clarification is essential for accurate vector analysis in geometric contexts.

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Familiarity with geometric conventions in vector mathematics
Knowledge of vector subtraction and its implications
Basic principles of coordinate systems

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Jun 4, 2020

angela107

Homework Statement: can someone see if my work is correct?

Relevant Equations: n/a

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Jun 4, 2020

member 587159

I think you made an error with calculating the vector ##\vec{BC}=[-4,0,0]##. I think you missed the minus sign here. You also want to consider ##\vec{BA}## instead of ##\vec{AB}##, so your solution checks out because two negatives cancel each other out.

Perhaps I'm misunderstanding your convention but I use ##\vec{AB}= \vec{B}- \vec{A}##.