Answer:
ST=23
RU=8
SV=5
SU=10
Step-by-step explanation:
RT bisects the whole quadrilateral, so a line on one side will be the same length as the line on the opposite side of RT. So:
1. ST=UT, UT=23, so ST=23
2. RU=RS, RS=8, so RU=8
3. SV=VU, VU=5, so SV=5
4. SU=2*SV, 5*2=10, so SU=10
If you still have no clue, just imagine the points R, S, T, and the lines connecting them (this will make a triangle). Then reflect the triangle across line RT, and name the new S point U (the new triangle still has the same line measures) . Make a line from S to U and make a point V from where RT and SU meet. This will make the figure in the picture.
Have a nice day! :)