Step 1
A) Select all that describes the line ZV

A median of a triangle is a line segment that joins a vertex to the mid-point of the side that is opposite to that vertex. Each triangle has 3 medians
B) Select all that describes the line ST

Perpendicular Bisector is a line or a segment perpendicular to a segment that passes through the midpoint of the segment.
C) Select all that describes line HI

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