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Transform polygons using matrices

The quadrilateral shown in the graph is transformed by matrix RR. Plot the resulting quadrilateral.
R=[130013]R=\left[\begin{array} {ccc} -\dfrac{1}{3} & 0 \\ 0 & \dfrac{1}{3} \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
Created with Raphaël
Created with Raphaël