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Which special quadrilateral is a parallelogram with equal diagonals?

Class 9Rectangle, Rhombus and SquareGeometry — Quadrilaterals
  • AKite
  • BTrapezium
  • CRectangle
  • DRhombus

Step-by-Step Solution

If a parallelogram has equal diagonals, the triangles on a common side are congruent (SSS), which forces adjacent angles to be equal; since they add to 180°, each is 90°. So it is a rectangle.
Answer: C) Rectangle

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