An equidistant line is a line that at any given point is the same distance to the points that defines it. In 2 dimensions it is equivalent to the bisector of the two points. In 3 dimensions it is defined for 3 points (2 points would give a bisector plane).
equidistant_line(x, y, z = NULL)
|x, y, z||
Vector of points. If z is given they must be in 3D, otherwise in 2D
A vector of lines