\underlinesegment{AB}The command \underlinesegment{AB} is used to denote a line segment with endpoints A and B, with a line drawn underneath the segment notation. This is typically used in geometry to emphasize the segment as a distinct object, often in the context of proofs or when highlighting specific segments in a geometric figure.
Indicating that line segment AB is congruent to line segment CD.
\underlinesegment{AB} \cong \underlinesegment{CD}Describing the midpoint of the line segment AB.
\text{The midpoint of } \underlinesegment{AB} \text{ is M}Expressing that the sum of segments AB and BC equals segment AC.
\underlinesegment{AB} + \underlinesegment{BC} = \underlinesegment{AC}