The postulates that involve congruence are the following :
The two other congruence postulates are :
They are theorems that specify the conditions that must be met for two triangles to be congruent.
Reflecting
The four congruence theorem for right triangles are:- LL Congruence Theorem --> If the two legs of a right triangle is congruent to the corresponding two legs of another right triangle, then the triangles are congruent.- LA Congruence Theorem --> If a leg and an acute angle of a right triangles is congruent to the corresponding leg and acute angle of another right triangle, then the triangles are congruent.- HA Congruence Theorem --> If the hypotenuse and an acute angle of a right triangle is congruent to the corresponding hypotenuse and acute angle of another triangle, then the triangles are congruent.- HL Congruence Theorem --> If the hypotenuse and a leg of a right triangle is congruent to the corresponding hypotenuse and leg of another right triangle, then the triangles are congruent.
Congruence is basically the same as equality, just in a different form. Reflexive Property of Congruence: AB =~ AB Symmetric Property of Congruence: angle P =~ angle Q, then angle Q =~ angle P Transitive Property of Congruence: If A =~ B and B =~ C, then A =~ C
HL congruence theorem
Similarity is where triangles have equal angles at each corner. Congruence is where triangles have sides of equal length.
the congruence theorems or postulates are: SAS AAS SSS ASA
They are theorems that specify the conditions that must be met for two triangles to be congruent.
they are all postulates or shortcuts on finding 2 triangles congruence, except that SAA does not exist.
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HA AAS
LA AAS [APEX]
LA and SAS [APEX]
LA ASA AAS [APEX]
The father of congruence of triangles is Euclid, a renowned ancient Greek mathematician known as the "Father of Geometry." In his seminal work, "Elements," Euclid laid down the foundational principles of geometry, including the concept of congruence of triangles. He established the criteria for triangle congruence, such as the Side-Angle-Side (SAS) and Angle-Side-Angle (ASA) postulates, which are still fundamental in modern geometry. Euclid's contributions to the study of triangles and their congruence have had a lasting impact on mathematics and geometric reasoning.
LA and SAS [APEX]
Koch's Postulates