Question

which segment is opposite to ∠u?
answer
(overline{rq})
(overline{ru})
(overline{qu})

Explanation:

In a triangle, the side opposite an angle is the side that does not form the angle (i.e., it is not connected to the vertex of the angle). For $\angle U$, the vertex is point $U$, so the connected sides are $\overline{QU}$ and $\overline{UR}$. The remaining side, $\overline{RQ}$, is opposite $\angle U$.

Answer:

$\overline{RQ}$