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Axis In Geometry

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#1 pyrrhon



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Posted 20 January 2008 - 03:34 PM


I have a little question with the geometry module : I would like to create the orthogonal projection of a point in the axis y=0 (or x=0), the problem is that axis are just displayed, and I can not select them.

So I thinked to draw the function y=0 but a function is not considered as a line, so I can not create a perpendicular line between this function and a point.

And finally I tried to create the line y=0 (with 2 points) but it's very very difficult to take 2 points with absciss=0. Even if you succeed to draw your line, there is another problem with this method : your "axis" y=0 can move, and so your figure becomes completly wrong.

If someone know how to active the axis and how to use them I am interested.. Thank you.

I am french, sorry for my english !

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