Question: why is axiom 5 considered a universal truth?
Answer: Why is Axiom 5, in the list of Euclid's axioms, considered a 'universal truth'? (Note that the question is not about the fifth postulate.) Euclid's Axiom 5 states that "The whole is greater than the part." Since this is true for anything in any part of the world. So, this is a universal truth.