Lines defined by direction ratios

Geometry Level 4

If the direction ratios of two lines are ⟨ a , b , c ⟩ \langle a,b,c \rangle and ⟨ 1 b c , 1 c a , 1 a b ⟩ \langle \frac{1}{bc}, \frac{1}{ca}, \frac{1}{ab} \rangle , then what is true about these lines?

The lines are penpendicular The lines are coincident The lines are parallel but not coincident The lines are intersecting but not perpendicular

Sandeep Bhardwaj by Sandeep Bhardwaj , 28, India

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