Euclid Euclid 365 BC - ca 300 BC Alexandria,Egypt. A straight line may be drawn from any one point to any other point. A finite straight line may be produced to any length in a straight line. P-3. A circle may be described with any centre at any distance from that centre.
All right angles are equal.
If a straight line meets two other straight lines, so as to make the two interior angles on one side of it together less than two right angles, the other straight lines will meet if produced on that side on which the angles are less than two right angles. The Fifth Postulate, also known as the Parallel Postulate, is considerably more elaborate than the previous four. The fact that Euclid's first 28 propositions depend only the the first four postulates suggests that he too was not altogether satisfied with it. For the next 2000 years mathematicans from all over the world would try to prove the fifth postulate from the first four.