THREE DIMENSIONAL GEOMETRY - NCERT
THREE DIMENSIONAL GEOMETRY 465 Hence, from (1), the d.c.’s of the line are 2 22 2 22 2 22, , a b c l m n abc abc abc =± =± =± ++ ++ ++ where, depending on the desired sign of k, either a positive or a negative sign is to be taken for l, m and n. For any line, if a, b, c are direction ratios of a line, then ka, kb, kc; k ≠ 0 is also a set of direction ratios.
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