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Unit 5 of 18
Triangle Relationships
Structure within triangles.
Every topic follows the curriculum standard
Learn→See→Try→Explain→Verify→Challenge→Transfer→Master
Topics in this unit
6 topics. Each card opens a full topic workspace and supports all eight learning actions.
Triangle Angle-Sum Theorem
180° proved, not memorized
Exterior Angle Theorem
Remote interior sum
Triangle Inequality
When three sides form a triangle
Classifying Triangles
By sides and by angles
Midsegments
Parallel halves
Three-pathway connections
Study this unit at three depths — current-grade mastery, advanced thinking, and competition mathematics.