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Question

Diagonals of a parallelogram bisect each other.
Given : PQRS is a parallelogram. Diagonals PR and QS intersect in point O.
TO prove : segPOsegRO,
segSOsegQO
1074029_9a0c5dc2892a41cb8f70bd3c1fc2d921.png

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Solution

PQRS is a parallelogram where PR and QS are diagonals intersect at point O
In POS and ROQ
SPO=QRO [ Alternate angles between parallel lines are equal ]
PSO=RQO [ Alternate angles between parallel lines are equal ]
POS=ROQ [ Vertically opposite angles ]
POSROQ [ By AAA congruence theorem ]
segPOsegRO [ By CPCT ]
segSOsegQO [ By CPCT ]

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