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Answers for “平面中的两个向量如何定义一个平行四边形?”

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Each column of a2×2a 2\times 2 matrix can be read as the coordinates of a vector in the 2D plane. For the matrix A=[3112]A = \begin{bmatrix} 3 & 1 \\ 1 & 2 \end{bmatrix}, the first column [31]\begin{bmatrix} 3 \\ 1 \end{bmatrix} represents the vector from the origin to the point (3,1), and the second column [12]\begin{bmatrix} 1 \\ 2 \end{bmatrix} represents the vector from the origin to the point (1,2).

Conditions: The matrix is 2×22\times 2.; Working in standard Cartesian coordinates.