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Mathematics, 22.03.2021 04:00 nettaboo9262

Which of the following calculations could NOT be used to prove a quadrilateral is a parallelogram 1. lengths of the 4 sides
2. slopes of the two diagonals
3. Slopes of the four sides
4. midpoints of the two diagonals​

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Which of the following calculations could NOT be used to prove a quadrilateral is a parallelogram 1...
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