1.

Prove that the points (2, -1), (0, 2), (2, 3) and (4, 0) are the coordinatesof the vertices of a parallelogram and find the angle between its diagonals.

Answer»

Prove that the points (2, -1), (0, 2), (2, 3) and (4, 0) are the coordinatesof the vertices of a parallelogram and find the angle between its diagonals.



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