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% https://alfurka.github.io/quick-tikz/
\def \triangleA {(-3.5,-2) -- (-0.5,3) -- (3,2) -- cycle}
\def \circleA {(1,-0.5) circle [radius=2]}
\begin{tikzpicture}[background rectangle/.style={fill=white}, show background rectangle]
% Axis
\draw (-5,0) -- (5,0);
\draw (0,-5) -- (0,5);
\draw[step=1,gray,very thin] (-4.8,-4.8) grid (4.8,4.8);
% Main shapes
\draw[blue] \triangleA;
\draw[red] \circleA;
% Intersection
\begin{scope}
\clip \triangleA;
\draw[pattern=north east lines, even odd rule] \circleA \triangleA;
\end{scope}
\end{tikzpicture}
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