Assertion (A): Two straight lines in space which are neither parallel nor intersecting are called skew lines.
Reason (R): If $θ$ is the angle between $\overset{r}{ˉ} = \overset{a}{ˉ} + λ \overset{ˉ}{b}$ and $\overset{r}{ˉ} \cdot \overset{n}{ˉ} = d$ then $cos θ = \frac{b ˉ \cdot n ˉ}{∣ b ˉ ∣∣ n ˉ ∣}$ .

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Assertion (A): Two straight lines in space which are neither parallel nor intersecting are called skew lines.

Reason (R): If $θ$ is the angle between $\overset{r}{ˉ} = \overset{a}{ˉ} + λ \overset{ˉ}{b}$ and $\overset{r}{ˉ} \cdot \overset{n}{ˉ} = d$ then $cos θ = \frac{b ˉ \cdot n ˉ}{∣ b ˉ ∣∣ n ˉ ∣}$ .

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