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Which condition alone is NOT sufficient to prove a quadrilateral is a parallelogram?

Class 9Conditions for a ParallelogramGeometry — Quadrilaterals
  • AOne pair of opposite sides equal only
  • BBoth pairs of opposite sides equal
  • CDiagonals bisect each other
  • DBoth pairs of opposite angles equal

Step-by-Step Solution

Just one pair of opposite sides being equal (without being parallel) does not force a parallelogram.
Answer: A) One pair of opposite sides equal only

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