If (a_1, b_1, c_1 ) and (a_2, b_2, c_2 ) be the direction ratios … - Vidyadip

Question

If $\left(a_1, b_1, c_1\right)$ and $\left(a_2, b_2, c_2\right)$ be the direction ratios of two parallel lines then

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Answer

(b) $\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}$
Explanation: We know that if there are two parallel lines then their direction ratios must have a relation
$\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}$

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