3 non-coplanar (pairwise) lines for 3 dimensional space.
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depend how many points are them
Two distinct (different) points are needed to determine a line.
2
If 2 points determine a line, then a line contains infinitely many planes.
To determine a trajectory line, only two points are needed. These two points can be used to calculate the slope, which represents the direction and angle of the trajectory. Additional points can be used to further refine the trajectory line and estimate its accuracy.