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well, you can call them a absoloute joke because this website is TERRIBLE !!
The means of the two variable, (x-bar, y-bar)
If two lines are parallel then the area of the plane between them is symmetrical about its centre-line (parallel to and mid-way between the boundary lines).
Parallell * * * * * It is the angle between the two lines.
Two non-parallel lines in space that do not intersect are called skew lines. The skew line symbol is a short horizontal bar above the two identifying letters.