Area of a parallelogram

What is the magnitude of (1,2,3)×(4,5,6)(1,2,3)\times(4,5,6) (equivalently, the area of the parallelogram they span)? Give a decimal to four places.

Show hints (2)+
  1. Compute the cross-product vector first.
  2. Then take its Euclidean norm 54\sqrt{54}.

Answer

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7.3485 (± 0.001)

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