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Euclid's fifth (parallel) postulate effectively says: if a straight line falling on two straight lines makes the interior angles on the same side together LESS than two right angles, then the two lines, if produced, will:

Class 9Euclid's AxiomsGeometry — Foundations
  • Ameet on that side
  • Bnever meet
  • Cmeet on the opposite side
  • Dbecome perpendicular

Step-by-Step Solution

If the co-interior angles sum to less than 180 deg (two right angles), the lines meet on that side when extended — the essence of the fifth postulate.
Answer: A) meet on that side

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