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Can somebody recomend me a software(preferably free) to draw a graphic like this:

diagram

I have downloaded GeoGebra, but it seems I can't use it to draw such a graphic.

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    Dia is free and should allow this too. http://live.gnome.org/Dia2012-05-07

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Inkscape is a general purpose open source vector graphics tool, available for all the standard platforms. I have used it for a few years. It works moderately well with LaTeX, and the price is right. Using Inkscape to produce a picture like the one you posted would be routine. Some fiddling might need to be done to get good positioning of labels.

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HTH