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38 lines
1.2 KiB
TeX
38 lines
1.2 KiB
TeX
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\documentclass[varwidth=true, border=2pt]{standalone}
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\usepackage{tikz}
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\usetikzlibrary{positioning, calc}
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\begin{document}
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\begin{tikzpicture}[scale=0.8]
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% draw the background
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\draw [line width=1.5pt, fill=gray!2] (0,0) -- (60:4) -- (4,0) -- cycle;
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\coordinate[label=left:$A$] (A) at (0,0);
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\coordinate[label=right:$B$] (B) at (4,0);
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\coordinate[label=above:$C$] (C) at (2,3.464);
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\coordinate[label=below:$c$](c) at ($ (A)!.5!(B) $);
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\coordinate[label=left:$b$] (b) at ($ (A)!.5!(C) $);
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\coordinate[label=right:$a$](a) at ($ (B)!.5!(C) $);
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% angle alpha
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\draw[fill=green!30] (0,0) -- (0:0.75cm) arc (0:60:.75cm);
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\draw (0.35cm,0.25cm) node {$\alpha$};
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% angle beta
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\begin{scope}[shift={(4cm,0cm)}]
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\draw[fill=green!30] (0,0) -- (-180:0.75cm) arc (180:120:0.75cm);
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\draw (150:0.5cm) node {$\beta$};
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\end{scope}
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% angle gamma
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\begin{scope}[shift={(60:4)}]
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\draw[fill=green!30] (0,0) -- (-120:.75cm) arc (-120:-60:.75cm);
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\draw (-90:0.5cm) node {$\gamma$};
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\end{scope}
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% the triangle
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\draw [line width=1.5pt] (A) -- (B) -- (C) -- cycle;
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\end{tikzpicture}
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\end{document}
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