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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?

Thanks

Will

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# 3d trig problem (i think)

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