Below is the latex code I used to create diagrams like this.
\newcommand{\circledone}[3]{
% draws a square with quarter circles off edges
% takes 3 inputs, #1 side, #2 rotation of shape, #3 side label
\begin{tikzpicture}[rotate=#2]
\filldraw [fill=blue,fill opacity=0.3,thick](0,0) arc (-90:-180:#1) -- (0,#1) arc (180:90:#1) --(#1,#1) arc (0:-90:#1);
% (4,4)--(4,0)--cycle;
%\draw (4,4) arc (0:-90:4);
\draw [dashed,thick,to-to] (0,0)--(0,#1) node [sloped,rotate=#2,above,midway]{#3};
\draw [dashed,thick,to-to] (0,#1)--(#1,#1) node [sloped,rotate=#2,above,midway]{#3};
\end{tikzpicture}
}