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\begin{tikzpicture}[scale=1.25]
\tkzDefPoint(0,0){A}\tkzDefPoint(6,0){D}
\tkzDefPoint(8,0){B}\tkzDefPoint(4,0){I}
\tkzDefLine[orthogonal=through D](A,D)
\tkzInterLC[R](D,tkzPointResult)(I,4 cm) \tkzGetFirstPoint{C}
\tkzDefLine[orthogonal=through C](I,C) \tkzGetPoint{c}
\tkzDefLine[orthogonal=through B](A,B) \tkzGetPoint{b}
\tkzInterLL(C,c)(B,b) \tkzGetPoint{T}
\tkzInterLL(A,T)(C,D) \tkzGetPoint{P}
\tkzDrawArc(I,B)(A)
\tkzDrawSegments(A,B A,T C,D I,C) \tkzDrawSegment[color=orange](I,C)
\tkzDrawLine[add = 1 and 0](C,T) \tkzDrawLine[add = 0 and 1](B,T)
\tkzMarkRightAngle(I,C,T)
\tkzDrawPoints(A,B,I,D,C,T)
\tkzLabelPoints(A,B,I,D) \tkzLabelPoints[above right](C,T)
\tkzMarkSegment[pos=.25,mark=s|](C,D) \tkzMarkSegment[pos=.75,mark=s|](C,D)
\end{tikzpicture}
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