Finding a plane that contains 2 lines.

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SUMMARY

This discussion focuses on determining whether a plane can contain two lines defined by parametric equations. It is established that two lines will define a plane if they are either intersecting or parallel; skew lines, which do not intersect and are not parallel, do not define a plane. The method to find the equation of the plane involves identifying two vectors from the parametric equations, calculating their cross product to obtain a normal vector, and then using this normal vector to formulate the plane's equation.

PREREQUISITES
  • Understanding of parametric equations in three dimensions
  • Knowledge of vector operations, specifically cross products
  • Familiarity with the concept of skew lines and their properties
  • Ability to derive equations of planes from normal vectors
NEXT STEPS
  • Study the properties of skew lines and their implications in three-dimensional geometry
  • Learn how to derive the equation of a plane from a normal vector and a point on the plane
  • Explore vector calculus techniques for analyzing intersections of lines and planes
  • Practice solving problems involving parametric equations and their geometric interpretations
USEFUL FOR

Students studying geometry, particularly those focusing on three-dimensional space, as well as educators and tutors looking for effective methods to teach the concepts of lines and planes in vector calculus.

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Homework Statement



I have 2 parametric equations of 2 lines. I want to find if there is a plane that contains both, if any, and find the equation.

Homework Equations





The Attempt at a Solution



so just thinking about it, I figure that a plane would contain both lines only if they intersect. Is that right?
if so, my second problem is finding the equation of the said plane. So for both the lines, do I plug in any value of t in the parametric equations to find 2 vectors, take the cross product to find a normal and use that for my equation?
 
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Kuma said:

Homework Statement



I have 2 parametric equations of 2 lines. I want to find if there is a plane that contains both, if any, and find the equation.

Homework Equations





The Attempt at a Solution



so just thinking about it, I figure that a plane would contain both lines only if they intersect. Is that right?
No, you could have two parallel lines, and they would determine a plane. The only way two lines would not determine a plane is if they are skew lines - lines that aren't parallel and that don't intersect.

I'm assuming that you're working in three dimensions.
Kuma said:
if so, my second problem is finding the equation of the said plane. So for both the lines, do I plug in any value of t in the parametric equations to find 2 vectors, take the cross product to find a normal and use that for my equation?
 
Mark44 said:
No, you could have two parallel lines, and they would determine a plane. The only way two lines would not determine a plane is if they are skew lines - lines that aren't parallel and that don't intersect.

I'm assuming that you're working in three dimensions.

thanks. Totally forgot about the parallel case. So I set my parametric equations equal to each other and found an intersection point. Yes this is in 3 dimensions
 

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