The flowchart shown below shows the sequence of steps to prove the theorem: Opposite angles of a parallelogram are equal:

PQ is parallel
to SR
Definition of
parallelogram
Angle 1 is
equal to angle 2
Alternate interior angles
PQRS is a
parallelogram
Given
Triangle PQS is
congruent to ROS
ASA postulate
PS is parallel
to QR
Definition of
parallelogram
Reflexive property
Angle 4 is
equal to angle 3
Alternate interior angles
Angle 5 is
equal to angle 6
CPCTC

Which is the missing statement? (6 points)

1) Angle 5 is equal to angle 5

2) Angle 5 is equal to angle 6

3) PS = QR

4) SQ = SQ