A perpendicular bi sector is a strait up and down line that goes from top to bottom dead in the middle.
Mid segment is a line straight threw the middle from side to side
altitude is a segment form vertex of a triangle to the opposite side and hit has to be perpendicular to that segment
Angle bisector deals with relative lengths of the 2 segments that a triangles side is divided into.
This 2 triangles stuck to gather and that line is the MID-SEGMENT of the 2