Category:Definitions/Angles between Lines in Space

This category contains definitions related to Angles between Lines in Space.
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Let $\LL_1$ and $\LL_2$ be two straight lines in space, which may or may not intersect each other.

Let $\mathbf u_1$ and $\mathbf u_2$ be vectors whose directions are parallel to $\LL_1$ and $\LL_2$ respectively, such that the angle $\theta$ between $\mathbf u_1$ and $\mathbf u_2$ is such that:

$0 \le \theta \le \dfrac \pi 2$

that is:

$0 \degrees \le \theta \le 90 \degrees$

The angle between $\LL_1$ and $\LL_2$ is defined as that $\theta$.