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1. Area of a triangle from vectors ●○○○○ 10 ptsLet $\mathbf{a} = \begin{pmatrix} 5 \\ 1 \end{pmatrix}$ and $\mathbf{b} = \begin{pmatrix} 2 \\ 4 \end{pmatrix}$. Find the area of the triangle with vertices $\mathbf{0}$, $\mathbf{a}$, and $\mathbf{b}$.