How can I find the midpoint of a line?
Is it possible to draw two perpendicular lines?
If you look at the two control points that define the line, and then average them you can find the midpoint of that line.
As far two perpendicular lines, you have to be more specific. perpendicular to what? There are infinite number of perpendicular lines you can draw to the midpoint of a line in 3D.
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