I am very beginner in tikz !
I want to draw picture with tikz:
1
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Have you tried something so far? – Romain Picot Jan 21 '16 at 8:39
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Not about this picture but I draw many simple pics. – hossein behboodi Jan 21 '16 at 8:50
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It is very easy using 'tkz-euclide' package. Follow the example from texdoc.net/texmf-dist/doc/latex/tkz-euclide/… at page 39. – ferahfeza Jan 21 '16 at 10:48
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You can take advantage of calc and intersections library to draw this picture.
\documentclass[margin=5mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc,intersections}
\begin{document}
\begin{tikzpicture}[>=stealth]
\coordinate (O) at (0,0);
\draw (-120:2)coordinate (B) arc (-120:120:2)coordinate(C);
\draw[<->] (-120:2.3) arc (-120:120:2.3)node[midway,fill=white]{$\beta$};
\path[name path=line1](C)--($(C)!2!-90:(O)$);
\path[name path=line2](O)--+(-5,0);
\fill [name intersections={of=line1 and line2}]
(intersection-1) circle (1.5pt);
\foreach \i in {O,B,C}
{\fill (\i)circle(1.5pt);}
\draw (B)--(intersection-1)--(C);
\draw [dashed](C)--(O)--(intersection-1);
\draw($(C)!0.1!(O)$)coordinate(c1)--($(c1)!1!90:(C)$)coordinate(c2)--($(c2)!1!90:(c1)$);
\draw[<->] (intersection-1)+(1,0)arc(0:30:1)node[midway,right,font=\scriptsize]{$\alpha$};
\draw[<->] ($(intersection-1)!0.3cm!90:(C)$)--($(C)!0.3cm!-90:(intersection-1)$)node[midway,sloped,fill=white]{$d/r$};
\end{tikzpicture}
\end{document}
Output
7
I started using tikz a while ago and i found great joy in doing the tutorials of the outstanding official documentation:
Official tikz & pgf documentation
The tutorials (starting at page 29) cover about everything that you need to do.
If you prefer less text there's also a great introduction to tikz, called "A very minimal introduction to Tikz:
