Mathematics — first biennium · Lesson
In geometry not every statement has the same role: some define language, some are assumed, and others must be proved.
In this lesson: Distinguish the role of primitive notions, definitions, postulates, theorems and proofs.
How to proceed: Ask: is it defining a term, is it an assumed starting point, or is it a property that requires proof? Primitive notions are basic concepts not defined from simpler geometric objects.
You can already assume: No specific prerequisite.
Completed exercises: 0/5 · Correct on first attempt: 0
Ask: is it defining a term, is it an assumed starting point, or is it a property that requires proof? Primitive notions are basic concepts not defined from simpler geometric objects.
Vertically opposite angles are congruent.
ConceptStep separates what is required from what is recommended or useful as reinforcement. Only required prerequisites block your progress.