Thread: Is the Universe Open, Closed, or Flat?
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Guille
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04-20-2005, 03:04 PM
Quote:
Originally Posted by AntonioLao
For Q2, the Pythagorean theorem is stated as follow

a^2+b^2=c^2

this theorem is true iff a right triangle is defined and Euclid fifth postulate is also true.
1) Thanks for answering.

2) What is the euclid fifth postulate?
  
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