- ATheorems
- BGuesses
- CMeasurements
- DDrawings
Step-by-Step Solution
Theorems are proved using definitions, axioms and postulates. The other options are not part of the deductive structure.
Answer: A) Theorems
Euclid's geometry is built on undefined terms, axioms, postulates and:
Class 9Euclid's PostulatesGeometry — Foundations
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