Hi Pablo,
I'm not sure I understand but I'll test tomorrow in high school.
With the file below, using what you offer, will the dimensions of my page
be respected ?

\setuplayout
   [header=\zeropoint,
    headerdistance=\lineheight,
    backspace=2cm,
    width=middle,
    topspace=\dimexpr 2cm-\headerheight-\headerdistance\relax,
    footer=\lineheight,
    height=middle]

\setupinteractionscreen[option=landscape]

\setuppagenumbering[alternative=,location=]

\definemixedcolumns
  [MyColumns]
  [
    n=2,
    separator=rule,
    rulecolor=,
    balance=yes,
  ]

\setupalign[verytolerant,stretch,hanging]

\starttext
\startMyColumns
\startformula
    \startmathalignment[n=2,align={left,left}]
    \NC P_1 + P_2 + \dots + P_{12} \NC = 400 + 400\times 1,05 + 400\times
1,05^2 + \dots + 400 \times 1,05^{11}\NR
    \NC  \NC = 400\times (1 + 1,05 + 1,05^2 + \dots + 1,05^{11})\NR
    \NC  \NC = 400\times \frac{1-1,05^{12}}{1-1,05}\approx 6\,367.\NR
    \stopmathalignment
  \stopformula
\dorecurse{6}{\input knuth}
\stopMyColumns
\stoptext


2017-10-16 19:35 GMT+02:00 Pablo Rodriguez <oi...@gmx.es>:

> On 10/16/2017 05:59 PM, Fabrice Couvreur wrote:
> > Hello,
> > I have printed this document and the page on the back is printed upside
> down
> > in fact you have to turn the page to read it.
> > How to correct this ?
> > Thank you
> > Fabrice
> >
> > \setuppapersize[A4,landscape]
>
> Hi Fabrice,
>
> [the command above is the only relevant one, lanscape page orientation.]
>
> If you use a recent version of Acrobat, you may use:
>
>    \setupinteractionscreen[option=landscape]
>
> This will automatically print it in the right way. In that case, you
> don’t have to select anything in Acrobat, the program will read it from
> the PDF document itself.
>
> If you use another viewer, select flip long edge of the paper.
>
> Just in case it helps,
>
> Pablo
> --
> http://www.ousia.tk
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