\documentclass[tikz]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.15}
\usepackage{mathrsfs}
\usetikzlibrary{arrows,calc}
\usepackage{tkz-euclide}
\pagestyle{empty}

\definecolor{AngleClr}{rgb}{0,0.39215686274509803,0}
\definecolor{ShapeClr}{rgb}{0.6,0.2,0}
\definecolor{BlueSqr}{RGB}{5,81,163}

\begin{document}

\begin{tikzpicture}[scale=.75]
\tkzSetUpLine[line width=1pt,color=black]
\tkzSetUpPoint[fill=black]

\tkzDefPoints{0/0/D,4/0/C,0/4/A,4/4/B}

\tkzDefMidPoint(A,C) \tkzGetPoint{O}

\tkzFillPolygon[fill=ShapeClr,fill opacity=0.1,inner sep=1cm](A,B,C,D)


\tkzDrawSegments[line width=1pt,color=black](A,C B,D)

\tkzMarkRightAngles[line width=1pt, size=.25,color=AngleClr,fill=AngleClr,fill opacity=0.1](A,B,C B,C,D C,D,A D,A,B)

\tkzDrawCircle[line width=0.75pt,color=black](O,A)

\tkzDrawPolygon[color=ShapeClr](A,B,C,D)
\tkzDrawPoints[size=3](A,B,C,D,O)
\tkzLabelPoint[above left](A){$\rm A$}
\tkzLabelPoint[above right](B){$\rm B$}
\tkzLabelPoint[below right](C){$\rm \Gamma$};
\tkzLabelPoint[below left](D){$\rm \Delta$};
\tkzLabelPoint[below](O){$\rm O$};

\tkzMarkSegments[mark=||,size=3](O,A O,B O,C O,D)

\end{tikzpicture}
\end{document}