added math style pentagon

pentagon-math-style.tex

@@ -0,0 +1,25 @@
+\documentclass[tikz]{standalone}
+\usetikzlibrary{angles, quotes}
+\tikzset{
+  mark with dashes/.style={
+    every to/.append style={edge node={pic{mark with dashes={#1}}}}},
+  pics/mark with dashes/.style={
+    /tikz/sloped, /tikz/allow upside down, /tikz/line width=+.4pt,% thin
+    code={
+      \foreach \i in {1, ..., #1}
+        \draw[line cap=round, shift=(left:{\i pt-(#1+1)/2}), pic actions]
+          (-1pt, -2pt) -- (1pt, 2pt);}}}
+
+% From https://tex.stackexchange.com/questions/692214/i-would-like-a-perfect-pentagon-with-108-angles
+
+
+\begin{document}
+\begin{tikzpicture}[angle eccentricity=1.5]
+\foreach[count=\j from 0, count=\i] \p in {below, below, right, above, left}
+  \coordinate["$\i$" \p] (c\i) at (90+72*2+\j*72:2);
+\node also[alias=c0] (c5) node also[alias=c6] (c1);
+\foreach[count=\j from 2, count=\k from 0] \i in {1, ..., 5}
+  \pic[draw, "$\alpha_\i$"] {angle=c\j--c\i--c\k};
+\draw[mark with dashes=2, thick] (c1) to (c2) to (c3) to (c4) to (c5) to cycle;
+\end{tikzpicture}
+\end{document}