Latex code for protractor (180 degree) 

\documentclass[pstricks,border=12pt]{standalone}  \SpecialCoor  \usepackage{pst-node,multido}    \makeatletter  \def\@protractor#1{%      \psset{dimen=middle,linewidth=.5\pslinewidth}      \pscustom{\psarc(0,0){#1}{0}{180}\psline(-#1,-.3)(#1,-.3)\closepath}      \multido{\na=0+90}{3}{\psline(!#1 .725 mul \na\space PtoC)}      \multido{\ns=0+1}{180}{\psline(!#1 .975 mul \ns\space PtoC)(#1;\ns)}      \multido{\nm=0+5}{37}{\psline(!#1 .950 mul \nm\space PtoC)(#1;\nm)}      \multido{\nl=0+10}{19}{%          \psline(!#1 .925 mul \nl\space PtoC)(#1;\nl)          \uput{!#1 .850 mul}[\nl]{!\nl\space 90 sub}(0,0){\small$\nl$}          \uput{!#1 .775 mul}[!180 \nl\space sub]{!90 \nl\space sub}(0,0){\small$\nl$}          \psline(!#1 .05 mul \nl\space PtoC)(!#1 .725 mul \nl\space PtoC)      }}  \def\protractor{\pst@object{protractor}}  \def\protractor@i(#1)(#2)#3{%     \begin@SpecialObj     \pcline[linestyle=none](#1)(#2)     \ncput[nrot=:U, npos=1]{\@protractor{#3}}%     \end@SpecialObj}  \makeatother    \begin{document}  \begin{pspicture}[showgrid=true](-5,-5)(10,5)      \protractor[linecolor=green!70!black](! 2 neg 1)(5;-10){5}      \pcline[nodesep=-2,linecolor=blue](! 2 neg 1)(5;-10)      \psdots(! 2 neg 1)(5;-10)  \end{pspicture}  \end{document}

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