Answer:
[tex]ST=XY[/tex]
Step-by-step explanation:
we know that
If two triangles are congruent
then
their corresponding sides are congruent
In this problem we have that
Triangle RST is congruent with Triangle TXY
so
[tex]RS=TX, ST=XY,TR=YT[/tex]
therefore
[tex]ST=XY[/tex]