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If the vertices A ,\ B ,\ C of a triangl...

If the vertices `A ,\ B ,\ C` of a triangle ABC are the point with position vectors `a_1 hat i+a_2 hat j+a_3 hat k ,\ b_1 hat i+b_2 hat j+b_3 hat k ,\ c_1 hat i+c_2 hat j+c_3 hat k` respectively, what are the vectors determined by its sides? Find the length of these vectors.

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