Mathematics - Linear Algebra - Matrices and matrix operations - Matrix as Transformation

Show a 2D grid with a shape (square or triangle). A 2×2 matrix is displayed with editable values. As the student changes matrix entries, the shape TRANSFORMS: rotation, scaling, shearing, reflection. Start with identity [[1,0],[0,1]] (no change). Try [[2,0],[0,2]] (scale up). Try [[0,-1],[1,0]] (rot