Mathematics — first biennium · Lesson
A congruence criterion must fix both shape and size. Matching data are not enough: their arrangement matters.
In this lesson: Recognize when data are sufficient for congruence and correctly apply SSS, SAS and ASA.
How to proceed: Identify corresponding data. For SAS the angle must be included between the two sides; knowing only three angles fixes shape but not size.
You can already assume: Proof language and triangle classification.
Completed exercises: 0/5 · Correct on first attempt: 0
Identify corresponding data. For SAS the angle must be included between the two sides; knowing only three angles fixes shape but not size.
Given data: AC=A'C', BC=B'C', ∠C=∠C'
ConceptStep separates what is required from what is recommended or useful as reinforcement. Only required prerequisites block your progress.
Relationships: solid line = required · dashed line = recommended · dotted line = reinforcement.