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Answers for “叉积的方向是如何确定的?”

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The magnitude of the cross product of two vectors a\mathbf{a} and b\mathbf{b} with angle θ\theta between them is ∣a∣∣b∣sin⁡θ|\mathbf{a}||\mathbf{b}|\sin \theta. Geometrically, this value represents the area of the parallelogram formed by the two vectors.

Conditions: a\mathbf{a} and b\mathbf{b} are three-dimensional vectors.; θ\theta is the angle between a\mathbf{a} and b\mathbf{b}.