the line
L₁ through two draggable points.
the line
L₂ through two draggable points.
the segment
realising the shortest distance between the lines (its two endpoints
are the closest points).
Drag any ● or
● to reshape a line.
Two lines in R³ either cross (one common point),
are parallel, or are skew (no common point and not
parallel — they miss each other in space).
Drag the background to orbit · scroll to zoom · axes labelled x, y, z.