Solving for k in 3D Plane Intersection at 60 Degrees

In summary, the conversation is about finding the value of k in a given plane equation if the plane makes a 60 degree angle with another plane. The recommended approach is to find the normal vectors for each plane and use the dot product to find the cosine of the angle between them. However, the teacher may require a proof for this method.
  • #1
kevykevy
25
0

Homework Statement


Given the plane x + ky + 2z - 9 = 0, find k if the plane makes an angle of 60 degrees with the plane 2x + 2y - z = 0.


Homework Equations





The Attempt at a Solution


I'm stumped on this question. No idea of even how to start this one.
 
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  • #2
can you find the angle between two vectors?
 
  • #3
First find the normal vector for each plane- that should be easy. Then use the dot product to find the cosine of those two vectors.
 
  • #4
as hallsofIvy mentioned, the angle between two planes is the angle between their normals. Using the dot product will give you the answer,

BUT

your teacher might require you to actually prove that the angle between two planes is the angle between their normals. to prove this, just study the quadrilateral formed by the two planes and the two normals.
 
  • #5
Just wondering... Are we now just giving out the solutions? We haven't even heard back from the OP.
 

What is the concept of 3D plane intersection at 60 degrees?

The concept of 3D plane intersection at 60 degrees involves finding the point where two planes intersect in three-dimensional space, while also having an angle of 60 degrees between them. This can be visualized as two planes intersecting at a sharp angle, creating a corner.

Why is it important to solve for k in 3D plane intersection at 60 degrees?

Solving for k is important because it helps determine the exact coordinates of the point of intersection between the two planes. This can be useful in various applications such as geometry, engineering, and physics.

What is the formula for solving for k in 3D plane intersection at 60 degrees?

The formula for solving for k involves setting up and solving a system of equations using the equations of the two planes. This is typically done by finding the point of intersection between the two lines of intersection of the planes and then substituting the coordinates into one of the plane equations to solve for k.

What are the different methods for solving for k in 3D plane intersection at 60 degrees?

There are various methods for solving for k, including using matrix operations, Gaussian elimination, and the substitution method. Each method has its advantages and may be more suitable for different scenarios.

Are there any real-world applications for 3D plane intersection at 60 degrees?

Yes, there are many real-world applications for this concept, such as determining the point of intersection between two roads or finding the angle of intersection between two planes in architectural designs. It can also be used in computer graphics to create 3D objects and in physics to calculate the trajectory of objects.

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