User:MathInclined/sandbox

$\usepackage{tikz} \def\firstcircle{(90:1.75cm) circle (2.5cm)} \def\secondcircle{(210:1.75cm) circle (2.5cm)} \def\thirdcircle{(330:1.75cm) circle (2.5cm)} \begin{document} \begin{tikzpicture} \begin{scope} \clip \secondcircle; \fill[cyan] \thirdcircle; \end{scope} \begin{scope} \clip \firstcircle; \fill[cyan] \thirdcircle; \end{scope} \draw \firstcircle node[text=black,above] {$A$}; \draw \secondcircle node [text=black,below left] {$B$}; \draw \thirdcircle node [text=black,below right] {$C$}; \end{tikzpicture}$