\begin{center}
\setlength{\unitlength}{1.5cm}
\renewcommand{\Pictlabelsep}{1}

\begin{Picture}(-1.5,-1.5)(2,1.5)
\regularPolygon[45]{\numberSQRTTWO}{4}
\Put(0,0){\circle*{0.1}}
\rPut{45}(0,0){r}
\xLINE(0,0)(0,-1)
\thicklines
\renewcommand{\Pictlabelsep}{0.1}
\xLINE(0,0)(1,1)
\xLINE(0,0)(1,0)
\xtrivVECTOR(0,-1)(1,-1)
\xtrivVECTOR(1,-1)(0,-1)
\rPut{b}(0.5,-1){\footnotesize\textbackslash Pictlabelsep}
\xtrivVECTOR(1,-1)(1,0)
\xtrivVECTOR(1,0)(1,-1)
\rPut{r}(1,-0.5){\footnotesize\textbackslash Pictlabelsep}
\polarreference\degreesangles
\xArc{0.3}{0}{45}
\degreesangles
\Put[22.5](0.3,22.5){$45^{\mathrm o}$}
\end{Picture}
\begin{Picture}(-1.5,-1.5)(2,1.5)
\Put(0,0){\circle*{0.1}}
\cPut{45}(0,0){c}
\Circle{1}
\thicklines
\xLINE(0,0)(\numberCOSXLV,\numberCOSXLV)
\xLINE(0,0)(1,0)
\xtrivVECTOR(0,0)(0,-1)
\xtrivVECTOR(0,-1)(0,0)
\renewcommand{\Pictlabelsep}{0.1}
\rPut{r}(0,-0.5){\footnotesize\textbackslash Pictlabelsep}
\polarreference\degreesangles
\xArc{0.3}{0}{45}
\degreesangles
\Put[22.5](0.3,22.5){$45^{\mathrm o}$}
\end{Picture}
\end{center}
