← Theoretical / proof-based

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In this program

Axiomatic systems
Angles and parallel lines
Triangle congruence (SAS, ASA, SSS)
Similarity and proportional segments
Right triangles
Special triangles
Circles: chords, tangents, inscribed angles, and arc measure

Euclidean foundations

Triangle congruence (SAS, ASA, SSS)

Geometry · Theoretical / proof-based

Topic

Triangle congruence (SAS, ASA, SSS)

Practice by unit: Euclidean foundations

Undergraduate Geometry — scope drawn from open college geometry texts and typical US Euclidean / transformational geometry syllabi.

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