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Unit 6 of 18
Triangle Congruence
When triangles are the same.
Every topic follows the curriculum standard
Learn→See→Try→Explain→Verify→Challenge→Transfer→Master
Topics in this unit
8 topics. Each card opens a full topic workspace and supports all eight learning actions.
Congruence Defined
All corresponding parts equal
SSS
Three sides determine the triangle
SAS
Two sides and the included angle
ASA & AAS
Angle-side structures
HL
The right-triangle shortcut
CPCTC
Using congruence to derive more
Why SSA & AAA Fail
The ambiguous and shape-only cases
Three-pathway connections
Study this unit at three depths — current-grade mastery, advanced thinking, and competition mathematics.