CD and DA of a quadrilateral ABCD such that AC ⊥ BD. Prove that PQRS is a rectangle.

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4. P, Q, R and S are respectively the mid-points of the sides AB, BC, CD and DA of a quadrilateral ABCD such that AC ⊥ BD. Prove that PQRS is a rectangle.
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4. P, Q, R and S are respectively the mid-points of the sides AB, BC, CD and DA of a quadrilateral ABCD such that AC ⊥ BD. Prove that PQRS is a rectangle. -q 4. P BC CD and DA of a quadrilateral ABCD such that AC ⊥ BD. Prove that PQRS is a rectangle. [...]
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Tags: -q , 4. P , BC , CD and DA of a quadrilateral ABCD such that AC ⊥ BD. Prove that PQRS is a rectangle. , R and S are respectively the mid-points of the sides AB ,