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PQRS is a parallelogram, if the two diagonals are equal, then the measure of PQR is:
  • a)
    30°
  • b)
    90°
  • c)
    60°
  • d)
    120°
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
PQRS is a parallelogram, if the two diagonals are equal, then the meas...
In a parallelogram, the diagonals are equal if and only if the parallelogram is a rectangle. This is because equal diagonals imply that the opposite angles are equal, and the only type of parallelogram where this happens is a rectangle.
In a rectangle, all angles are 90. Therefore, the measure of ∠PQR is: 90.
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