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If a line has the direction ratios '-18,(12) ,-4', then what are its directión cosines? |
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Answer» If a, b, c are the direction ratios of a LINE then its d.c.'s are `(a)/(sqrt(a^2+b^2+c^2), (b)/(sqrt(a^2+b^2+c^2), (c)/(sqrt(a^2+b^2+c^2)` i.e., `(-18)/22, (12)/22, (-4)/22` i.e., `(-9)/11, (6)/11, (-2)/11` |
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