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3d trig problem (i think)

  1. Aug 1, 2011 #1

    Not sure if this is simple or not but I can't figure out how to do it! I am designing a surround that will be constructed by folding a sheet of aluminum. I've got the geometry right in 3d but I want to transpose this to a template. Yes I can measure but I want to solve using maths for two reasons, one because i'm curious and can't do it and two, it will be more accurate.

    One side is a mirror of the other, have just labelled for clarity. Distances A and C are the same when constructed (59). A I think will remain 59 but C I am not sure about? Distance B is unknown and what I would like to find, then I can just join a line between the two to obtain length C.

    For the bottom triangles, distance D is known.

    Let me know if other distances are needed and I will figure whether I know them or not?




  2. jcsd
  3. Aug 3, 2011 #2
    Can no one help on this? Am I missing some information?
  4. Aug 3, 2011 #3


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    Science Advisor

    Your pictures are too unclear.
  5. Aug 3, 2011 #4
    Thanks for the response. Stuff always clear in your own head! Now that I know they are not understandable, I try to make them clearer. I have attached some images that will hopefully make it clear. From a perspective viewpoint, this is what I want to end up with.


    From the Side


    And from the top


    The angle (theta) in the side image has been calculated and is known. 7.6 deg.

    I am making it out of a sheet of aluminum so I need to know dimensions in 2d so that they give me the desired shape in 2d. The 2d shape will be folded to give the 3d one.

    In 2d, I don't know the angles phi and tau from this image.

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