2013-11-14 23:05:32 +01:00
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\documentclass{article}
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\usepackage[pdftex,active,tightpage]{preview}
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\setlength\PreviewBorder{2mm}
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\usepackage{amsmath,amssymb}
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\usepackage{tikz}
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2015-10-14 14:25:34 +02:00
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\usetikzlibrary{calc}
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2013-11-14 23:05:32 +01:00
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\begin{document}
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\begin{preview}
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\begin{tikzpicture}
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\newcommand\angleR{35}
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\newcommand\radiusR{4cm}
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\coordinate[label=below left:$O$] (O) at (0,0);
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\draw[->,very thick] (0,0)--(0,5) node[above] {$x$};
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\draw[->,very thick] (0,0)--(-2.5,0) node[left] {$y$};
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\node at (90+15:\radiusR+0.5cm) {$\alpha > 0$};
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\node at (90-15:\radiusR+0.5cm) {$\alpha < 0$};
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\draw[fill=orange!30] (-1,-1) rectangle (1,2);
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\draw[fill=blue!30] (0,2) circle (0.3cm);
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% Draw angle
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\begin{scope}[shift={(0,0)}]
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\draw[thick, <->] ([shift={({90+\angleR}:\radiusR)}]-0.0,0) arc ({90+\angleR}:{90-\angleR}:\radiusR);
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\end{scope}
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\end{tikzpicture}
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\end{preview}
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\end{document}
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