File:Coppernicus 140.svg

% complile with »pdflatex«
\documentclass[tikz,convert=pdf2svg]{standalone}
\usepackage{tkz-euclide}
\usetkzobj{all}
\begin{document}
 \begin{tikzpicture}
  \tkzSetUpLine[line width=0.4pt]
  \pgfmathsetmacro{\OA}{1.52};
  \pgfmathsetmacro{\Y}{sqrt(2)/2};
  \tkzDefPoint(90:\OA){A}
  \tkzDefPoint(180:\OA){B}
  \tkzDefPoint(-90:\OA){C}
  \tkzDefPoint(0:\OA){D}
  \tkzDefPoint(90:0.5*\OA){R}
  \tkzDefPoint(180:0.5*\OA){R2}
  \tkzDefPoint(135:\Y*\OA){Y}
  \tkzDefPoint(0,0){O}
  \tkzDrawCircle(O,A)
  \draw (A) to (B);
  \draw (A) to (C);
  \draw (A) to (D);
  \draw (B) to (C);
  \draw (B) to (D);
  \draw (C) to (D);
  \draw (R) +(0:0.15) node{$r$};
  \draw (R2) +(-90:0.15) node{$r$};
  \draw (Y) +(135:0.15) node{$y$};
 \end{tikzpicture}
\end{document}