What is the HL theorem of right triangle

What is the HL theorem of right triangle

The hypotenuse and a right edge correspond to two equal right triangle congruence (HL)
This is the original text of Chapter 11, page 14 of the mathematics book

How to prove triangle congruence HL

2. Two triangles congruent (SAS) with two sides and their included angles corresponding to equality. Two triangles congruent (ASA) with two sides and their included edges corresponding to equality. Note: s is the abbreviation of edge, A is the abbreviation of angle, which can be deduced from 3 to 4. Two triangles are congruent (AAS) with two corners and the opposite side of one corner corresponding to the same. 5. The congruent conditions of right triangle are: the hypotenuse and the straight corner corresponding to the same two right triangle congruent (HL)

The difference between definition, concept, etc. (for example)

Modern Chinese Dictionary
Definition D ì ngy ì is a precise and brief explanation of the essential characteristics of a thing or the connotation and extension of a concept
Concept is one of the basic forms of thinking, which reflects the general and essential characteristics of objective things. In the process of cognition, human beings extract and summarize the common characteristics of things they feel, and then they become concepts. For example, by extracting their common characteristics from snow, white horse, white paper and other things, we can get the concept of "white"
Meaning y ì y ì
① The content represented by words or other signals
② Value; function: Revolutionary ~