Distance Between Two Points on a Line

Distance Between Two Points on a Line

For parametric points:

$$P(\lambda_1)=\vec a+\lambda_1\vec d$$

and:

$$Q(\lambda_2)=\vec a+\lambda_2\vec d$$

their distance is:

$$PQ=|\lambda_2-\lambda_1||\vec d|$$

Usage

- Used when two points are specified by parameters on the same line.

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