I will not write out the whole 2 column proof for you, but I will give you the necessary pieces.
The trick here is to show that length of PR=length of QS which is done by adding the equal lengths PQ and RS to QR.
Then you have 2 right triangles with hypotenuse and legs equal (so congruent).
Then PT and SV are equal because they are corresponding parts of congruent triangles.