\input{preamble-standalone.ltx} \begin{document} % Ex. No. 189 (Section 22.5 : Determining a slope) \begin{tikzpicture}[scale=1.5] \tkzInit[xmax=4,ymax=5]\tkzGrid[sub] \tkzDefPoint(1,2){A} \tkzDefPoint(3,4){B} \tkzDefPoint(3,2){C} \tkzDefPoint(3,1){D} \tkzDrawSegments(A,B A,C A,D) \tkzDrawPoints[color=red](A,B,C,D) \tkzLabelPoints(A,B,C,D) \tkzFindSlope(A,B){SAB} \tkzFindSlope(A,C){SAC} \tkzFindSlope(A,D){SAD} \pgfkeys{/pgf/number format/.cd,fixed,precision=2} \tkzText[fill=Gold!50,draw=brown](1,4)% {The slope of (AB) is : $\pgfmathprintnumber{\SAB}$} \tkzText[fill=Gold!50,draw=brown](1,3.5)% {The slope of (AC) is : $\pgfmathprintnumber{\SAC}$} \tkzText[fill=Gold!50,draw=brown](1,3)% {The slope of (AD) is : $\pgfmathprintnumber{\SAD}$} \end{tikzpicture} \end{document}