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### Large braces over several items in an itemize with text by the brace

This question is related to this question: Adding large brace next to body text, but is not a duplicate. I have an itemize in a beamer presentation. I want to put a brace over some of these items. So ...
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### Insertion of perpendicular symbol at intersection of two perpendicular lines

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 ...
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### TikZ: how to find the intersection of two extended lines?

From How to draw a line passing through a point and perpendicular to another? I learned to use shorten to extend lines. But the extended part doesn't seem to "really exist". For example, I would like ...
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### TikZ - How can I draw a line through a point on a line, with the new line perpendicular to the old line?

I have a line A-B between the two points A and B and a point X on A-B. Now I'd like to draw a line through X which then is perpendicular to the line A-B. How can I do this? Also: No other (directly ...
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### Perpendicular line to two-points-line given the length

I have two points A and B, I call the line consisting of A and B as LAB:ax+by+c=0, I would like to draw a line segment starting from the point B perpendicular to LAB and with length len such that the ...
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### How to draw orthogonal vectors using TikZ

I have the problem, that I want to draw a vector that is decomposed into two orthogonal parts. A short example: \documentclass{article} \usepackage{tikz} \usetikzlibrary{calc} \begin{document} \begin{...
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### Can I enlarge lines in TikZ?

I'm currently creating lecture notes for "Geometry and Topology". As we now arrived at part about euclidean geometry, I quite often have the situation that I need to visualize lines (not line segments,...
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### Reflecting a line and/or point with named coordinates

This code does not work with named coordinates (such as the following code). How can I reflect the blue line over the red line by using coordinate names. And how do I reflect just a named coordinate? ...
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### How to add perpendicular symbol at desired location

I am trying to draw perpendicular symbol on point where the perpendicular line from O is meeting the line AB. But I am unable to achieve it. I try via simple draw because I use pgfplots (you can see ...
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### Drawing some simple orthogonal projections

I'm a beginner with TikZ and I'd like to show that a vector y can be decomposed as How can I tell TikZ to draw a dashed line orthogonal to yp onto X and a vector ε orthogonal to X, starting at the ...