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Thread: Can a “right tetrahedron” represent a vector?

  1. #1 Can a “right tetrahedron” represent a vector? 
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    May 2019
    A tetrahedron encloses a region of space with four plane surfaces (triangles). The tetrahedron has six edges. Each edge marks the intersection of two surfaces. It also has four vertices (corners), each vertex marks the intersection of three surfaces.

    A “right tetrahedron” may be constructed from four right triangles, this is not a tri-rectangular tetrahedron. A tri-rectangular tetrahedron has three right triangles and one Isosceles triangle.

    The four surfaces are all right triangles. A right triangle is shown as a group of three edges in brackets. The longest edge is shown last in each triangle bracket;

    (x1, x2, x5) (x5, x3, x4) (x2, x3, x6) (x1, x6, x4)

    x12 + x22 = x52 , x52 + x32 = x42 , x22 + x32 = x62 , x12 + x62 = x42

    A “component angle” (A1, A2, A3, A4) may be associated with each surface.

    x1 = x5Cos(A1) and x2 = x5Sin(A1)
    x5 = x4Cos(A2) and x3 = x4Sin(A2)
    x2 = x6Cos(A3) and x3 = x6Sin(A3)
    x1 = x4Cos(A4) and x6 = x4Sin(A4)

    A right tetrahedron may also be associated with a vector (X) in 3D; X = x1e1 + x2e2 + x3e3

    1 , e2 , e3 are directional vectors in 3D (basis vectors)
    x1 , x2 , x3 are scalar components

    The vector has a magnitude; |X| = x4

    The scalar components are related to magnitude; x12 + x22 + x32 = x42

    Sub-component (x5) is; x52 = x12 + x22 = x42 - x32

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    Last edited by Dywyddyr; March 18th, 2020 at 12:45 PM.
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    Genius Duck Dywyddyr's Avatar
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    Which part of "Stop trying to push traffic to your own site: if you have something to discuss then do it here.
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    " did you not understand?

    "[Dywyddyr] makes a grumpy bastard like me seem like a happy go lucky scamp" - PhDemon
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