This provides good details on How to draw a line passing through a point and perpendicular to another?. What I would like to do is to extend this somehow to add the usual geometry symbol to indicate that the two lines are indeed perpendicular. I could code a manual solution for each situation, but would like a macro, one that would draw it of an appropriate size, and allow me to choose the orientation (i.e., select one of the four quadrants) for this symbol.
Here's one possible approach that uses a TikZ style. You insert the angle symbol by using the style
The quadrant can be selected by using
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Another possibility is to use my package tkz-euclide (now on ctan and texlive 2011) but you don't need to get all the objects that I defined. Only angles are necessary. I take the Jake's example to show you that you can mix tikz and tkz.
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