In the diagram, $NOPQ$NOPQ is a parallelogram. Triangles $\triangle NQR$△NQR and $\triangle POR$△POR are congruent.
Which side in $\triangle POR$△POR corresponds to side $QR$QR?
If $NR$NR is $4$4 cm long, how long is $PR$PR?
The diagonals of a parallelogram:
The figure shows quadrilateral $ABCD$ABCD , such that $AB$AB is parallel to $CD$CD
and $AD$AD is parallel to $BC$BC.
Consider the parallelogram $ABCD$ABCD. We want to deduce a property of the diagonals of a parallelogram.
In parallelogram $ABCD$ABCD, $AB$AB is parallel to $DC$DC and $BC$BC is parallel to $AD$AD.