1.

If the magnitudes of vectors A, B and C are 12, 5 and 13 units respectively and A + B = C, the angle between vectors A and B is:

A. 0                     
B.        \[\pi \]   
C. \[\frac{\pi }{2}\]                        
D.        \[\frac{\pi }{4}\] 
Answer» D.        \[\frac{\pi }{4}\] 


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