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本文通过对四面体的研究,给出了异面直线的距离公式,可用其在一般情况下求异面直线的距离。引理1 在四面体A-BCD中,设对棱AD和BC所成的角为a,则
In this paper, the tetrahedron is studied and the formula of the distance of the straight line is given. It can be used to find the distance of the straight line in the general situation. Lemma 1. In the tetrahedron A-BCD, let the angle between the AD and BC be a, then