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+\begin{tikzpicture}[scale=.6]
+ \tkzDefPoints{0/0/A,8/0/B,3.5/10/I}
+ \tkzDefMidPoint(A,B) \tkzGetPoint{O}
+ \tkzDefPointBy[projection=onto A--B](I)
+ \tkzGetPoint{J}
+ \tkzInterLC(I,A)(O,A) \tkzGetPoints{M'}{M}
+ \tkzInterLC(I,B)(O,A) \tkzGetPoints{N}{N'}
+ \tkzDrawSemiCircle[diameter](A,B)
+ \tkzDrawSegments(I,A I,B A,B B,M A,N)
+ \tkzMarkRightAngles(A,M,B A,N,B)
+ \tkzDrawSegment[style=dashed,color=blue](I,J)
+ \tkzShowTransformation[projection=onto A--B,
+ color=red,size=3,gap=-3](I)
+ \tkzDrawPoints[color=red](M,N)
+ \tkzDrawPoints[color=blue](O,A,B,I)
+ \tkzLabelPoints(O)
+ \tkzLabelPoints[above right](N,I)
+ \tkzLabelPoints[below left](M,A)
+\end{tikzpicture}