mar/graphics/cable_angle.tex

%&tex
\documentclass{standalone}
\usepackage{tikz}
\usepackage{siltex}
\usetikzlibrary {arrows.meta,positioning}
\usepackage{gensymb}
\input{graphics/tics.tikz}
% Compliant PDF
\usepackage[a-3u]{pdfx}

\begin{document}
\begin{tikzpicture}[thick, on grid, x = 2.16cm, y = 2.16cm, >=Stealth]
    			
    %Whiteboard
    \def \smallangle {30}
        \filldraw[gray] (0,0) -- (0.4,0) arc [start angle=0, end angle=\smallangle, radius=0.4] -- cycle;
        \node at ({cos(\smallangle/2)*0.6},{sin(\smallangle/2)*0.6}) {$\smallangle\degree$};
        \draw[->] (0,0) -- (0,1);
        \node at (0.1,1) {$g$};
        \draw[->,red] (0,0) -- ({cos(\smallangle)/sin(\smallangle)},1);
        \draw[->] (0,0) -- ({cos(\smallangle)/sin(\smallangle)},0);
        \node at ({cos(\smallangle)/sin(\smallangle)},-0.1) {$a$};
        \draw (0,0) pic {masspoint};

    \begin{scope}[shift={(0,1.4)}]
    \def \smallangle {60}
        \filldraw[gray] (0,0) -- (0.4,0) arc [start angle=0, end angle=\smallangle, radius=0.4] -- cycle;
        \node at ({cos(\smallangle/2)*0.6},{sin(\smallangle/2)*0.6}) {$\smallangle\degree$};
        \draw[->] (0,0) -- (0,1);
        \node at (0.1,1) {$g$};
        \draw[->,red] (0,0) -- ({cos(\smallangle)/sin(\smallangle)},1);
        \draw[->] (0,0) -- ({cos(\smallangle)/sin(\smallangle)},0);
        \node at ({cos(\smallangle)/sin(\smallangle)},-0.1) {$a$};
        \draw (0,0) pic {masspoint};
    \end{scope}
    

    		%	\fill[pattern = north east lines] ($ (0,0) + (-1,0) $) rectangle ($ (0,0) + (1,0.5) $);
    		%	\draw[thick] ($ (0,0.5) + (-1,0) $) -- ($ (0,0.5) + (1,0) $);
    		%	
    		%	%draw arm and joints
                %        \fill (0,0.5) circle (0.2);  
                %        \draw[thick] (0,0.5) to node[midway,right,draw=none] {$a$} (-1.5,3.5);  
                %        \fill (-1.5,3.5) circle (0.2); 
                %        \draw[thick] (-1.5,3.5) to node[midway,above,draw=none] {$b$}(1.51,4.26);		
                %        
                %        %draw mass
                %        \draw (1.7,4.32) circle (0.2) node {$m$};
                %        
                %        %draw arc
	    	%	%\draw[dashed,gray] (-1.5,3.5) -- ++(2.5,0);
	    	%	%\draw (1,0.5) arc (0:116:1cm) node[above,midway] {$\theta$};	

    		%	%\draw [arrow] (c.south) -- +(0,-1cm) node[midway,right,draw=none] {$F_{g} = m \cdot g$};
\end{tikzpicture}
\end{document}