Gottfried Leibniz
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leonhard euler
It was created for the use of congruence between segments, angles, and triangles. Also it was created for the transitional property of congruence, symmetry property of congruence, and Reflexive property of congruence.
Conventionally you use the symbol that looks like an "equals" sign but consists of three lines. It is the same symbol as is used for identities. ABC ≡ PQR
English mathematician William Jones developed the symbol for Pi in 1706.William Jones
there are 4 types of congruence theorem-: ASA,SSS,RHS,SAS