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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: Lesson 8: Solve for unknown angles—angles in a triangle
Triangle angle challenge problem 2

Triangle angle challenge problem 2

Example of angle hunting!

License: CC BY-NC-SA by Khan Academy

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