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LaTeX-examples/tikz/triangle-unit-circle/triangle-unit-circle.tex

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\documentclass{article}
\usepackage[pdftex,active,tightpage]{preview}
\setlength\PreviewBorder{2mm}
\usepackage{tikz}
\usepackage{tkz-euclide}
\usetikzlibrary{angles,quotes}
\usetkzobj{all}
\usetikzlibrary{shapes, calc, decorations}
\usepackage{amsmath,amssymb}
\usepackage{helvet}
\usepackage[eulergreek]{sansmath}
\begin{document}
\begin{preview}
\begin{tikzpicture}[very thick,font=\sansmath\sffamily,x=3cm,y=3cm]
\tkzInit[xmax=1.0,ymax=1.0,xmin=-1.0,ymin=-1.0]
\tkzGrid
\tkzAxeXY[up space=0.2,right space=0.2, label options={fill=none}]
\tkzDefPoint(0,0){A}
\tkzDefPoint({cos(FPpi/5)*1},0){B}
\tkzDefPoint({cos(FPpi/5)*1},{sin(FPpi/5)*1}){C}
\tkzDefPoint(1,0){CircleEnd}
\tkzDrawCircle(A,CircleEnd)
% \tkzLabelPoints[below left,font=\sansmath\sffamily](A)
% \tkzLabelPoints[below right,font=\sansmath\sffamily](B)
% Mark angle
\tkzMarkAngle[arc=l,size=0.6cm,fill=green!30](B,A,C)
\tkzLabelAngle[pos=0.15](B,A,C){$\alpha$}
% Draw polygon
\tkzDrawPolygon(A,B,C)
\tkzDrawSegment[black!60!green,very thick](A,B)
\tkzDrawSegment[red,very thick](B,C)
% Label lines
\tkzLabelSegment[above](A,C){$1$}
\tkzLabelSegment[sloped,above=-0.05,red](B,C){$\sin(\alpha)$}
\tkzLabelSegment[below,black!60!green](A,B){$\cos(\alpha)$}
\end{tikzpicture}
\end{preview}
\end{document}