- AParallel postulate
- BTriangle postulate
- CCircle postulate
- DPoint postulate
Step-by-Step Solution
Euclid's fifth postulate deals with parallel lines, so it is famously called the parallel postulate.
Answer: A) Parallel postulate
Euclid's fifth postulate is also commonly known as the:
Class 9The Fifth PostulateGeometry — Foundations
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