Question

given:
l, m, n are midpoints
altitude to \overline{ac}
segment bt
segment bl
segment as

Explanation:

Step1: Recall the definition of an altitude

An altitude of a triangle is a perpendicular segment from a vertex to the line containing the opposite side.

Step2: Analyze each segment

• Segment \(BT\): It is not perpendicular to \(AC\) as per the given figure.
• Segment \(BL\): It is a mid - segment (since \(L\) is a midpoint) and not an altitude.
• Segment \(AS\): In the figure, \(AS\perp AC\) (as indicated by the right - angle symbol at \(S\)).

Answer:

segment \(AS\)