\input{preamble-standalone.ltx} \begin{document} % Ex. No. 162 (Section 20.2.3 : Circle defined by a center and a measure, and special cases) \begin{tikzpicture}[scale=.5] \tkzDefPoint(0,8){A} \tkzDefPoint(8,0){B} \tkzDefPoint(8,8){C} \tkzDefPoint(4,4){I} \tkzDefPoint(2,7){E} \tkzDefPoint(6,4){F} \tkzDrawCircle[R](I,4 cm) \tkzInterLC[R](A,C)(I,4 cm) \tkzGetPoints{I1}{I2} \tkzInterLC[R](B,C)(I,4 cm) \tkzGetPoints{J1}{J2} \tkzInterLC[R](A,B)(I,4 cm) \tkzGetPoints{K1}{K2} \tkzDrawPoints[color=red](I1,J1,K1,K2) \tkzDrawLines(A,B B,C A,C) \tkzInterLC[R](E,F)(I,4 cm) \tkzGetPoints{I2}{J2} \tkzDrawPoints[color=blue](E,F) \tkzDrawPoints[color=red](I2,J2) \tkzDrawLine(I2,J2) \end{tikzpicture} \end{document}