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I figured it out after quite a bit of trial and error from some random example I found on the net. Here is my final copy if anyone every comes across this and needs some basic arrows


\begin{tikzpicture}[>=latex',
ref lines/.style={thin, blue!60},
ref points/.style={circle, black, opacity=0.7 ...

I need help drawing the three right angles (the little boxes) on my altitudes and I have no clue how. Thank you, here's my code:

\documentclass[10pt]{article}
\usepackage{amsmath,amssymb}
\usepackage{tikz}
\usetikzlibrary{intersections}
\usetikzlibrary{calc}

\begin{document}
\begin{tikzpicture ...

Ok so I am trying to emulate Figure 3 from http://www.math.siu.edu/kocik/papers/metaptolemiana.pdf which is located on page 2 of the .pdf

here is what I have gotten so far:

\documentclass[12pt]{amsart}
\usepackage{fullpage}
\usepackage{amsmath,tikz,geometry,amsthm}
\usepackage{amssymb ...

Thank you, but could you link me to a guide or website that show's how to update to the newest build so I can use the intersection library because I have no clue even what to search on how to update.

I downloaded the latest build now what do I do? I found an install file but it's not and .exe file. Thank you so much for your help.

Thank you so much for the helpful post. I cannot get my editor to output because of the intersections library. I get this error:

"c:\program files\miktex 2.7\tex\generic\pgf\modules\pgfmodulematrix.code.tex(5): Error: ! I can't find file `tikzlibraryintersections.code.tex'.
"c:\program files\miktex ...

I need to make a circle that is exactly like the one on the first page of http://www.math.siu.edu/kocik/papers/metaptolemiana.pdf in Figure 1 (the right hand circle) here is all I could conjure up:

\documentclass[12pt]{amsart}
\usepackage{fullpage}
\usepackage{amsmath,tikz,fullpage,amsthm ...