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\begin{tikzpicture}
\tkzDefPoints{0/0/A,3/1/B,0.9/-1.2/P}
\tkzDefPointBy[projection = onto B--A](P) \tkzGetPoint{H}
\pgfresetboundingbox
\tkzDrawLines[add=.5 and .5](P,H)
\tkzMarkRightAngle[german,size=.5,draw](A,H,P)
\tkzDrawPoints[](A,B,P,H)
\tkzDrawLines[add=.5 and .5,fill=blue!20](A,B)
\tkzMarkRightAngle[german,size=.8](P,H,B)
\end{tikzpicture}
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