Two lines, whose direction ratios are : 1 , b 1 , c 1 > and 2 , b 2 , c 2 > respectively…

Mathematics · JEE Main · NTA Exams — Three Dimensional Geometry

1. \(\frac{\mathrm{a}_{1}}{\mathrm{~b}_{1}}=\frac{\mathrm{a}_{2}}{\mathrm{~b}_{2}}=\frac{\mathrm{c}_{1}}{\mathrm{c}_{2}}\)
2. 
3. a₁a₂ + b₁b₂ + c₁c₂ = 0
4. a₁a₂ + b₁b₂ + c₁c₂ = 1

Answer

(C) a 1 a 2 + b 1 b 2 + c 1 c 2 = 0

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