The key point is that you are completely free to choose any coordinate system yo

Question

The key point is that you are completely free to choose any coordinate system you want in which to manipulate the vectors. It is a matter of convenience only, and so you must consider which orientation will simplify finding the components of the given vectors and interpreting the results in that coordinate system to get the required answer. Considering these factors, and knowing that you are going to be required to find the length of C and its angle with respect to A , which of the following orientations simplifies the calculation the most?

A. The x axis should be oriented along A  
B. The x axis should be oriented along B  
C. The x axis should be oriented along C

Explanation / Answer

The x axis should be oriented along C .

Because if we orient the x axis along C then we can directly measure the length of C from its value on X axis but it is not possible in other cases.

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