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A rhombus has perimeter 40 cm and one diagonal of 12 cm. Find the other diagonal.

Class 9Rectangle, Rhombus and SquareGeometry — Quadrilaterals
  • A14 cm
  • B20 cm
  • C8 cm
  • D16 cm

Step-by-Step Solution

Side = 10 cm. Half of 12 is 6, so the other half-diagonal = √(100 − 36) = 8 cm; the diagonal is 16 cm.
Answer: D) 16 cm

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