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If the direction cosines of two lines are connected by the relations $a l + b m + c n = 0 and u l^{2} + v m^{2} + w n^{2} = 0$ , then the two lines are parallel if

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∑a2v+w=0

∑u2b+c=0

∑u2a=0

∑a2u=0

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detailed solution

Correct option is D

The condition that the lines whose direction ratios are connected by the relation al+bm+cn=0 and ul2+vm2+wn2=0is a2u+b2v+c2w=0

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If the direction cosines of two lines are connected by the relations al+bm+cn=0 and ul2+vm2+wn2=0, then the two lines are parallel if

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Ready to Test Your Skills?

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If the direction cosines of two lines are connected by the relations $a l + b m + c n = 0 and u l^{2} + v m^{2} + w n^{2} = 0$ , then the two lines are parallel if