
Concept explainers
Scalar triple product Another operation with
65. Explain why the position vectors u, v, and w are coplanar if and only if |u ∙ (v × w)| = 0. (Hint: See Exercise 63).
63. Consider the parallelepiped (slanted box) determined by the position vectors u, v, and w (see figure). Show that the volume of the parallelepiped is |u ∙ (v × w) |, the absolute value of the scalar triple product.

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