The figure below shows a parallelogram pqrs: a parallelogram pqrs is shown with the diagonal sq. the flowchart shown below shows the sequence of steps to prove the theorem: opposite angles of a parallelogram are equal: the flow chart has one box in the first column, two boxes in the second column, three boxes in the third column, and two boxes in the fourth column. the label in the box in the first column is pqrs is a parallelogram and the reason written below it is given. two arrows are shown from the box, one pointing to the upper box in the second column and the other pointing towards the lower box in the second column. the topmost box in the second column has the label pq is parallel to sr inside the box. the label below the box is definition of parallelogram. the lower box in the second column has ps is parallel to qr written inside the box and definition of parallelogram written below the box. the upper box in the second column leads to the upper box in the third column which has the label angle 1 is equal to angle 2 inside the box and alternate interior angles below the box. the lower box in the second column leads to the lowermost box in the third column which is empty with the reason alternate interior angle below the box. the middle box in the third column has the label sq = sq inside the box and reflexive property below the box. all the three boxes in the third column lead to a box inside which the label is triangle pqs is congruent to rqs and label below the box is asa postulate. this leads to the last box which has the label angle 5 is equal to angle 6 inside the box and cpctc below the box which is the missing statement?

angle 1 is equal to angle 6

angle 5 is equal to angle 3

angle 5 is equal to angle 6

angle 4 is equal to angle 3