problem using hatching

[Daahli]

Hey,

I would really appreciate some help on the following problem: I draw a graph with some nice intersections, and would then like use hatching to highlight some of the areas which are created by the intersection. In other words, the intersection of the lines creates triangles, squares, ....

Unfortunately I have played around with Draw a bit, but have not even found a way to draw a simple triangle and then use hatching on it .

Thanks for any advice

[tony.groves]