Can Intersecting Planes Be Represented by a New Form of 3D Angles?

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Discussion Overview

The discussion revolves around the concept of representing the 'angle' between intersecting planes in three-dimensional space, specifically whether this can be formulated as a new type of 3D angle rather than relying on traditional 2D angles. The scope includes mathematical representation and theoretical implications in geometry and linear algebra.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant inquires about the possibility of defining a new form of 3D angle to represent the intersection of three perpendicular planes.
  • Another participant suggests looking up "solid angle" as a potential relevant concept.
  • A participant connects the discussion to linear transformations and rotations in higher dimensions, questioning the relationship between solid angles and rotations.
  • One participant clarifies that a solid angle is not equivalent to a rotation in three dimensions, emphasizing the need for additional parameters such as a point and an axis for defining rotations.
  • A further contribution reflects on the conceptual nature of angles, suggesting that understanding their definitions and applications is crucial when extending ideas into higher dimensions.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between solid angles and rotations, indicating a lack of consensus on the definitions and implications of these concepts in three-dimensional space.

Contextual Notes

There are unresolved aspects regarding the definitions of angles and their applications in higher dimensions, as well as the specific mathematical frameworks that may or may not support the proposed new form of 3D angles.

fromage
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i would like to know if the 'angle' between let's say the walls of a room (ie. the intersection of 3 planes all perpendicular to each other) can be represented in mathematical terms, but as a kind of 3D angle- that is to say not as a combination of 2D angles but as an altogether new form of representing the gap between intersecting planes.
Is there any way to do this and if not why can't these 'angles' be represented in 3D?
 
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Welcome to PF;
Look up "solid angle".
 
Cool, Simon.

I'm in Linear Algebra right now, so correct me if I'm wrong... But isn't this also what we are talking about with certain linear transformations, which can be rotations in any number of dimensions?

-Dave K
 
No, a "solid angle" is NOT a rotation in three dimensions, any more than a regular angle is a rotation in two dimensions. You can use an angle, in two dimensions to define a rotation but you will also need to specify a point to rotate about. You can use a solid angle to define a rotation but in three dimensions, you will need to specify a point to rotate about and an axis of rotation.
 
"angle" is one of those concepts you use, almost unconsciously, without really thinking about what it is. Looking at the "similar threads" section (below the "quick reply" box) there is a lot of discussion. You should look up the terms and then read some of the other threads.

Like HallsofIvy points out, it can be important to distinguish the thing from it's uses.
When you want to extend an idea that works in 2 or 3 dimensions, into 4 or more, then you really need to be clear about what the idea embodies.
 

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