Question

answer attempt 2 out of 2
$overline{su}$ is a perpendicular bisector.
$s$ is the vertex of two angles that are congruent to one another.
$s$ is the vertex of a right angle.
$s$ is the midpoint of a segment in the diagram.
$u$ is the midpoint of a segment in the diagram.
none of the above.

Explanation:

The two angles at vertex S are marked as congruent with the same angle - marking symbol. There is no indication that $\overline{SU}$ is a perpendicular bisector, that S is the vertex of a right - angle, that S is the mid - point of a segment, or that U is the mid - point of a segment.

Answer:

S is the vertex of two angles that are congruent to one another.