THREE DIMENSIONAL GEOMETRY - NCERT
11.1.6 Skew lines are lines in the space which are neither parallel nor interesecting. They lie in the different planes. 11.1.7 Angle between skew lines is the angle between two intersecting lines drawn from any point (preferably through the origin) parallel to each of the skew lines. 11.1.8 If l 1, m 1, n 1 and l 2, m 2, n 2
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