Elementary Geometry for College Students (6th Edition)

$\overline{RT}$ = $\overline{SV}$ $\overline{RT}$ $\bot$ $\overline{SV}$
RSTV is a square and a square is always a rectangle. According to the properties of a rectangle, both diagonals are congruent. Therefore $\overline{RT}$ = $\overline{SV}$. RSTV is a square and a square is always a rhombus. According to the properties of a rhombus, the diagonals will intersect at a right angle. Therefore $\overline{RT}$ $\bot$ $\overline{SV}$.