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:
Describe and compare the concepts of similarity and congruence