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[" while CF and DE intersectat Y,prove t...

[" while CF and DE intersectat Y,prove that "XY=sqrt(4)BC],[" Q7: ABCD is a trapezium in which "AB//CD" and "AD=BC" .IfP,Q "R," S be respectively the midpoint of "AB,BD,cD" and "CA],[" then show that "PQRS" is a rhombus."]

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