Question

he figure below shows segments PQ and RS which intersect at point T. Segment PR is parallel to segment SQ.

Two line segments PQ and RS intersect at T. Segments PR and SQ are parallel to each other.

Which of these facts is used to prove that triangle PTR is similar to triangle QTS?

Line segment RT is congruent to line segment TP.
Line segment ST is congruent to line segment TQ.
Angle PTR is congruent to angle QTS.
Angle PRT is congruent to angle QTS.