Final answer:
The line which bisects a line segment at right angles is known as a perpendicular bisector, splitting the segment into two equal parts and forming a 90° angle with it.
Step-by-step explanation:
A line which bisects a line segment at right angles is called a perpendicular bisector. This means the dividing line cuts the segment into two equal parts at the middle of the line, and it forms a 90° angle (a right angle) with the line segment.
The point where the perpendicular bisector intersects the segment is also referred to as the origin of the two new segments that have been created. This concept is fundamental in geometry and is instrumental in constructing symmetric shapes and proving various geometric theorems.