#### Answer

TS = 13
RT = 18.38

#### Work Step by Step

Since RSTV and WXYZ are squares, all the sides are equal, and thus ZT=SY=RX=WV=5
Since STY is a right-angled triangle, by using the Pythagorean Theorem,
$TS^{2}= 5^{2}+12^{2}=169$
$TS=13$
Since RST is a right-angled triangle, by using the Pythagorean Theorem,
$RT^{2}=13^{2}+13^{2}=338$
$RT=\sqrt 338=18.384776...$
$RT\approx18.38$