[Tex/LaTex] Making triangular hat

Question

Is it possible in Latex to make a triangular hat? The one that is used in math over three letters representing points to indicate a triangle.

Something like:

Answer 1

This can be done using the \overset command, which takes two arguments. The first argument would be the symbol or character that you want to place on top, while the second would be the main character. \overset{\triangle}{ABC} would produce the result you are after, with a triangle centered above ABC

This requires amsmath-package. I tend to load mathtools, as it fixes some stuff from amsmath, and is generally advisable to use. You can find out more about the command, and related once in section 4.10 in the documentation for amsmath.

Not that you can always locate the documentation using the command-line/terminal by writing texdoc amsmath, and that works for any package. The documentation is also available at http://ctan.org/pkg/amsmath

It might sound tedious to look up the documentation for various small problems/features, but the package documentations tend to be well-written and easy to browse. Also, it will at the same time help you to understand how LaTeX works.

Output

Code

\documentclass[11pt]{article}
\usepackage{mathtools}
\begin{document}

As you can see in triangle \(\overset{\triangle}{ABC}\), alternatively \(\triangle ABC\) would probably be better for inline, as it doesn't require so much text-height.
\end{document}