Triangle

\def\a{24} \def\b{14} \def\c{20}
 \tkzInit[xmax=22,xmin=-2,ymax=12,ymin=-2]
 \tkzClip
 \tkzDefPoint(0,0){A}   \tkzLabelPoint[below left](A){$A$}
 \tkzDefPoint(\c,0){B}  \tkzLabelPoint[below right](B){$B$}
 \tkzDefPoint(0,\b){F1} \tkzDefPoint(\c,\a){F2}
 \tkzInterCC(A,F1)(B,F2) \tkzGetPoint{C}
 \tkzLabelPoint[above](C){$C$}
 \tkzDrawPolygon(A,B,C)
 \tkzMarkAngle[scale=1.5](B,A,C)
 \tkzLabelSegment[below](A,B){$\SI{\c}{\m}$}
 \tkzLabelSegment[above right](B,C){$\SI{\a}{\m}$}
 \tkzLabelSegment[left](A,C){$\SI{\b}{\m}$}
\end{tikzpicture}