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  • OK, so r is 400mm and let's say that A is 30 degrees.

    In that case, sin(30) is 0.5 so the opposite angle of the RAT with the blue line as the H is 200mm.
    The A length is 346mm.

    If you move the start point of the red line up by 200mm that means the A length of the RAT with red as the H is now 146mm. The angle B can be calculated as

    tab(b)=200/146, so angle B is 53.9 degrees.

  • Cool, thanks. I should be able to put that into a little excel workbook

    In case you're interested, it's for a set of shelving, here's a model of it.

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