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Euclid himself was uncomfortable with the fifth postulate because, compared to the first four, it was:

Class 9The Fifth PostulateGeometry — Foundations
  • Aless self-evident / more complicated
  • Bobviously false
  • Ctoo short
  • Dimpossible to state

Step-by-Step Solution

Unlike the first four short, self-evident postulates, the fifth was long and not as obvious, so even Euclid delayed using it.
Answer: A) less self-evident / more complicated

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