Final answer:
Segment HE is congruent to itself due to the Reflexive Property of Congruence, which states that any geometric figure or segment is exactly equal to itself.
Step-by-step explanation:
The statement, segment HE is congruent to itself, is known to be true because it is a fundamental principle in geometry that all line segments are congruent to themselves. This is known as the Reflexive Property of Congruence. What the Reflexive Property of Congruence means is that any geometric figure or segment is always exactly equal to itself. This is a basic axiom in geometry that does not rely on measurements or comparisons to other segments.