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\begin{center}
\begin{tikzpicture}
\tkzDefPoint(0,0){A} \tkzDefPoint(7,0){B} \tkzDefPoint(7/2+3,0){vH}
\tkzLabelLine[below left](A,B){$a$} \tkzCompass(A,B)
\tkzInterCC(A,B)(B,A) \tkzGetPoints{P1}{P2}
\tkzCompass(A,P1) \tkzCompass(B,P1) \tkzCompass(A,P2)\tkzCompass(B,P2)
\tkzDrawLine(P1,P2) \tkzInterLL(P1,P2)(A,B) \tkzGetPoint{M}
\tkzInterLC(P1,P2)(M,vH) \tkzGetPoints{V}{VUSELESS} \tkzCompass(M,V)
\tkzInterLC(P1,P2)(V,M) \tkzGetPoints{VX}{MAGAIN} \tkzCompass(V,VX)
\tkzInterCC(M,VX)(VX,M) \tkzGetPoints{V1}{V2}
\tkzCompass(M,V1)\tkzCompass(M,V2)\tkzCompass(VX,V1)\tkzCompass(VX,V2)
\tkzDrawLine(V1,V2) \tkzInterLL(P1,P2)(V1,V2) \tkzGetPoint{M2}
\tkzInterLC(A,B)(A,M) \tkzGetPoints{MX}{MAGAIN} \tkzCompass(A,MX)
\tkzInterCC(MX,M)(M,MX) \tkzGetPoints{A1}{A2}
\tkzDrawLine(A1,A2) \tkzInterLL(A1,A2)(V1,V2) \tkzGetPoint{AV}
\tkzInterLC(A,B)(A,AV) \tkzGetPoints{USELESS}{AK9} \tkzCompass(A,AK9)
\tkzDefMidPoint(AV,AK9) \tkzGetPoint{AK}
\tkzCompass(AV,AK) \tkzCompass(AK9,AK)
\tkzInterLL(V1,V2)(A,AK) \tkzGetPoint{D}
\tkzDrawLine(A,D) \tkzLabelLine[above left](A,D){$d$}
\tkzInterLC(A,B)(B,M) \tkzGetPoints{MAGAIN}{MXB} \tkzCompass(B,MXB)
\tkzDrawLine(MX,MXB) \tkzInterCC(B,MXB)(MXB,B)
\tkzGetPoints{120}{USELESS} \tkzCompass(B,120) \tkzCompass(MXB,120)
\tkzInterLL(B,120)(V1,V2) \tkzGetPoint{C}
\tkzDrawLine(B,C) \tkzLabelLine[below right](B,C){$b$}
\tkzLabelLine[below](D,C){$c$}
\tkzDrawPolygon[fill=blue!30, opacity=.3](A,B,C,D)
\tkzMarkRightAngles(A,M,P1 M,M2,V2 M,A,AV A,AV,V)
\tkzDrawPoints(A) \tkzLabelPoints(A,B,D,C)
\end{tikzpicture}
\end{center}
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