Khan Academy (English - US curriculum)
Math by grade
Eureka Math/EngageNY
Geometry (Eureka Math/EngageNY)
Module 1: Congruence, proof, and constructions
Topic D: Lessons 22-25: Congruence criteria
Topic D: Lessons 22-25: Congruence criteria
Triangle congruence postulates/criteria
Why SSA isn't a congruence postulate/criterion
Determining congruent triangles
Determine congruent triangles
Proofs concerning isosceles triangles
Proofs concerning equilateral triangles
Isosceles & equilateral triangles problems
Find angles in isosceles triangles
Corresponding angles in congruent triangles
Find angles in congruent triangles
