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requires pstricks-add (because of the brace)

\input pst-eps
\input pst-plot
\input pst-node
\input pstricks-add
\TeXtoEPS

\psset{linecolor=black,linewidth=1.2pt}
\psset{unit=2.5cm}
\pspicture*(-1.1,-.4)(1.1,1.2)

\pswedge(0,0){1}{0}{180} % semicircle

\psline[linewidth=.6pt,linestyle=dashed,dash=3pt 4pt](0,-.2)(0,1.1)
\psbrace[linewidth=.6pt,nodesepB=-8pt,rot=90](0,-4pt)(1,-4pt)
        {\scalebox{1.5}{$r$}}
\endpspicture

\endTeXtoEPS
\nopagenumbers
\end

1. Create EPS
   

   $ tex Semicircle.tex && dvips -E Semicircle.dvi

2. Outline fonts
   

   $ eps2eps -dNOCACHE Semicircle.ps Semicircle2.eps

3. Fix bounding box
   

   $ ps2epsi Semicircle2.eps Semicircle.eps

4. Convert to Sketch
   

   $ pstoedit -f sk Semicircle.eps Semicircle.sk

5. Convert to SVG
   

   $ skconvert Semicircle.sk Semicircle.svg

6. Fix Semicircle.svg with Inkscape and Notepad