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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
586
13:27

Two column proof showing segments are perpendicular

Using triangle congruency postulates to show that two intersecting segments are perpendicular

Khan Academy
Congruence postulates
534
11:05

Congruent triangle example 2

Showing that segments have the same length

Khan Academy
Congruence postulates
529
12:13