Answer
$\angle R$ and $\angle V$ are supplementary AND
$\angle S$ and $\angle T$ are supplementary
Work Step by Step
In trapezoid $RSTV$ with $RS\parallel TV$, there are two sets of supplementary angles. $\angle R$ and $\angle V$ are supplementary AND $\angle S$ and $\angle T$ are supplementary by theorem 2.1.4: If two parallel lines are cut by a transversal, then the interior angles on the same side of the transversal are supplementary.
