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\begin{tikzpicture}[scale=1,ra/.style={fill=gray!20}]
% fixed points
\tkzDefPoint(0,0){A}
\tkzDefPoint(1,0){I}
% calculation
\tkzDefPointBy[homothety=center A ratio 10 ](I) \tkzGetPoint{B}
\tkzDefMidPoint(A,B) \tkzGetPoint{M}
\tkzDefPointWith[orthogonal](I,M) \tkzGetPoint{i}
\tkzInterLC(I,i)(M,B) \tkzGetSecondPoint{C}
\tkzDrawSegment[style=orange](I,C)
\tkzDrawArc(M,B)(A)
\tkzDrawSegment[dim={$1$,-16pt,}](A,I)
\tkzDrawSegment[dim={$a/2$,-10pt,}](I,M)
\tkzDrawSegment[dim={$a/2$,-16pt,}](M,B)
\tkzMarkRightAngle[ra](A,I,C)
\tkzDrawPoints(I,A,B,C,M)
\tkzLabelPoint[left](A){$A(0,0)$}
\tkzLabelPoints[above right](I,M)
\tkzLabelPoints[above left](C)
\tkzLabelPoint[right](B){$B(10,0)$}
\tkzLabelSegment[right=4pt](I,C){$IC=\sqrt{a}$}
\end{tikzpicture}
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