Are Skew Lines Considered Perpendicular in 3D with Parallel Vectors?

In summary, the lines L1 and L2 are considered orthogonal, but that does not necessarily mean they will intersect. Perpendicular lines can only intersect if they lie in the same plane. In the case of the x and y axes, they are perpendicular and intersect when the x-axis is in its original position, but they do not intersect when the x-axis is raised to y=0, z=1. So, in essence, perpendicular lines do not always intersect, even if their directions are perpendicular.
  • #1
mohamed el teir
88
1
in 3D assume two skew lines L1: x=x°+at, y=y°+bt, z=z°+ct, L2: x=x°°+ds, y=y°°+es, z=z°°+fs. therefore L1, L2 parallel vectors are respectively: v1= <a, b, c>, v2= <d, e, f>. if v1.v2= ad+be+cf= 0 (vectors are perpendicular), are the line L1, L2 considered perpendicular also or beside the dot product of their parallel vectors being zero the lines must also intersect (must not be skew) ??
 
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  • #2
The lines would be considered orthogonal, but that does not imply that they intersect.
Consider the x and y axes. The intersect in the plane z=0. But if you raise the x-axis to y=0, z=1, it will never intersect the y-axis defined by x=0, z=0.
 
  • #4
RUber said:
The lines would be considered orthogonal, but that does not imply that they intersect.
Consider the x and y axes. The intersect in the plane z=0. But if you raise the x-axis to y=0, z=1, it will never intersect the y-axis defined by x=0, z=0.
do you mean that in the case that x-axis is in its original position the x and y axes are perpendicular and intersect, and in the case that the x-axis is in y = 0, z = 1 the x and y axes are perpendicular and doesn't intersect ?
 
  • #5
mohamed el teir said:
do you mean that in the case that x-axis is in its original position the x and y axes are perpendicular and intersect, and in the case that the x-axis is in y = 0, z = 1 the x and y axes are perpendicular and doesn't intersect ?

Yes. Perpendicular lines only intersect if they lie in the same plane.
 
  • #6
Yes. That was your question, right? If orthogonal lines must intersect or not.
 
  • #7
RUber said:
Yes. That was your question, right? If orthogonal lines must intersect or not.
yes sort of that, if lines with perpendicular directions but the lines themselves are skew, are they considered perpendicular or not, so they are perpendicular, thank you
 

Related to Are Skew Lines Considered Perpendicular in 3D with Parallel Vectors?

1. What is the definition of skew lines?

Skew lines are two lines in three-dimensional space that are not parallel and do not intersect. They lie in different planes and have no common point of intersection.

2. How can you determine if two lines are skew?

To determine if two lines are skew, you can find the vector equation for each line and check if the direction vectors are not parallel and the lines do not intersect. Another method is to calculate the dot product of the direction vectors, and if it is equal to zero, then the lines are skew.

3. What is the relationship between skew lines and parallel lines?

Skew lines and parallel lines are two types of non-intersecting lines. The main difference between them is that parallel lines lie in the same plane, while skew lines lie in different planes.

4. Can skew lines ever be perpendicular?

No, skew lines can never be perpendicular because perpendicular lines intersect at a 90-degree angle, and skew lines do not intersect at all.

5. How are skew lines used in real life?

Skew lines are used in various fields, such as engineering, architecture, and computer graphics. For example, they are used in 3D modeling to create realistic structures and objects. In civil engineering, the concept of skew lines is used to design roadways and bridges that need to intersect at an angle.

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