documentclass{article}
usepackage{pstricks}
begin{document}
psset{unit=0.1}
begin{pspicture}(20,65)(50,80)
psline{-}(20,68)(50,68)
put(27,70){$37^circ$}
psarc{-}(20,68){6.5}{0}{37}
rput{37}(20,68){psline{-}(0,0)(30,0)}
end{pspicture}
end{document}