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Another Pythagorean theorem proof

Visually proving the Pythagorean Theorem

Khan Academy
Pythagorean theorem proofs
509
10:21

Pythagorean theorem proof using similarity

Proof of the Pythagorean Theorem using similarity

Khan Academy
Pythagorean theorem proofs
507
09:51

Other triangle congruence postulates

SSS, SAS, ASA and AAS postulates for congruent triangles. Showing AAA is only good for similarity and SSA is good for neither

Khan Academy
Congruence postulates
569
13:27