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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math by grade
Eureka Math/EngageNY
Geometry (Eureka Math/EngageNY)
Module 1: Congruence, proof, and constructions
Topic B: Lessons 9-11: Unknown angle proofs
Vertical angles are congruent proof
Vertical angles are congruent proof
Proving that vertical angles are equal
License: CC BY-NC-SA by Khan Academy