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So they dont eventually run into each other.

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15y ago
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Q: Why must lines be parallel?
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Related questions

What is important about parallel?

The importance is that parallel lines must never meet.


How are perpendicular lines similar to intersecting lineshow are they different?

The question is baffling. They're not different. Perpendicular lines must be intersecting lines.The only lines that are not intersecting lines are parallel lines. If two lines arenot parallel, then they must intersect, and they can be perpendicular or not.


What is an antonym for skew lines?

Parallel Lines - Skew lines are lines that do not intersect and do not lie in the same plane. If two lines lie in the same plane they they must either intersect or they are parallel.


Can two lines with positive slopes be parallel?

yes they can be parallel because for a pair of lines to be parallel the slope must be the same no matter if the slope is positive or negative.


Slope of parallel lines?

I don't exactly understand what you are trying to say in this question. However, one thing I can tell you about the slope of parallel lines is that they are equal. Parallel lines must have the same slope.


What Lines that neither intersect nor are parallel?

If lines neither intersect nor are parallel, then they must be drawn in 3D space, or a higher dimension.(These lines are called skew lines)


If two lines do not intersect must they be parallel?

If the two lines lie in the same plane, and they do not intersect, then they are parallel. If they are not in the same plane, and do not intersect, then they are called skew lines.


How can trapezoid be a parallelogram?

A trapezoid has only one pair of parallel lines so it cannot be a parallelogram which must have two pairs of parallel lines.


Do lines that aren't parallel always intersect?

Yes, they do. By definition, lines that never intersect must be parallel, so all non-parallel lines must intersect at some point. Given that they are normal lines (y=mx+b) they will always have a point that suffices the equation when they are set equal to each other.


Two lines that do not intersect and are in different planes?

They are skew lines. Two parallel lines must be in the same plane.


What are lines that go on foever and never cross?

In 2-dimensional space they must be parallel. In 3-d space they be parallel or skew lines I believe.


How are two line that are parallel to each other different from any other two lines?

Two parallel lines never meet or intersect. Two lines that aren't parallel must have one point somewhere where they intersect.