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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 88 (Section 12.2.5 : Drawing a tangent option \tkzimp{from})
\begin{tikzpicture}[scale=.5]
\tkzDefPoint(0,0){B}
\tkzDefPoint(0,8){A}
\tkzDefSquare(A,B)
\tkzGetPoints{C}{D}
\tkzDrawSquare(A,B)
\tkzClipPolygon(A,B,C,D)
\tkzDefPoint(4,8){F}
\tkzDefPoint(4,0){E}
\tkzDefPoint(4,4){Q}
\tkzFillPolygon[color = green](A,B,C,D)
\tkzDrawCircle[fill = orange](B,A)
\tkzDrawCircle[fill = purple](E,B)
\tkzDefTangent[from=B](F,A)
\tkzInterLL(F,tkzFirstPointResult)(C,D)
\tkzInterLL(A,tkzPointResult)(F,E)
\tkzDrawCircle[fill = yellow](tkzPointResult,Q)
\tkzDefPointBy[projection= onto B--A](tkzPointResult)
\tkzDrawCircle[fill = blue!50!black](tkzPointResult,A)
\end{tikzpicture}
\end{document}
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