\begin{tikzpicture}[vec/.style={-{Latex[length=3mm]}, thick}, >=Latex]
  \coordinate (O) at (0,0);
  \coordinate (A) at (4,0.6);
  \coordinate (B) at (1.2,3.2);
  \coordinate (C) at ($(A)+(B)$);

  \fill[teal!25] (O) -- (A) -- (C) -- (B) -- cycle;

  \draw[->, gray] (-0.6,0) -- (5.2,0);
  \draw[->, gray] (0,-0.6) -- (0,4.2);

  \draw[dashed, gray] (A) -- (C) -- (B);

  \draw[vec, red!70!black] (O) -- (A) node[below right, black] {$v_1=(a,b)$};
  \draw[vec, blue!70!black] (O) -- (B) node[above left, black] {$v_2=(c,d)$};

  \node[teal!50!black] at ($(A)!0.5!(C)$) {Área $=|\det A|$};
\end{tikzpicture}