SSS-side, side, side
SAS-side, angle, side
ASA-angle, side, angle
SAA-side, angle, angle
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they are all postulates or shortcuts on finding 2 triangles congruence, except that SAA does not exist.
reflexive property of congruence
Pascal (both the Persians and the Chinese) discovered the congruence of traingle during the eleventh century
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HYA is a HYA ...