Recall that a median of a triangle is a line that goes from one vertex to the midpoint of the opposite side.
An angle bisector is a line that splits an angle into two equal angles.
An altitude of a triangle is a line that goes from one vertex to the opposite sides and the angle formed by the line and the side is a right angle.
Answer:
(a) Median of triangle FGH.
(b) Angle bisector of (c) Altutite of triangle ABC.