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Transform polygons using matrices

The triangle shown in the graph is transformed by matrix RR. Plot the resulting triangle.
R=[2112]R=\left[\begin{array} {ccc} 2 & -1 \\ 1 & 2 \end{array} \right]
Created with RaphaëlCreated with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël