Answer
Therefore, the red segment is neither a median nor an altitude.
Work Step by Step
The red segment is not a median because it is not coming from one of the vertices of the triangle, although it does split $\overline{AB}$ into two congruent segments.
The red segment is not an altitude either because although it is perpendicular to $\overline{AB}$, it is not originating from one of the vertices of the triangle.
