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why is he not multiplying the 3 to the A in part A as he does in B. In B he doubles and triples the lengths of the sides.

Hi olever8, thanks for the question. In part A, the video shows the vector A length multiplied by 3, as expected. Perhaps what you're noticing is that I overlooked saying it was multiplied by 3 at one point, but the multiplying does indeed happen.