Here, a very abbreviated version of the story is presented. What many experts feel is offensive and repugnant may actually be true.What stands the “test of time” may not be absolutely true.Common sense could be the greatest obstacle to finding truth.The story is worthy of a movie or a play. The conception and arrival of non-Euclidean geometry involved three mathematicians-one very famous and two completely unknown. This subject, “Euclidean geometry” (the type of geometry you studied in high school), was so popular and dominant that no one, for over two millennia, doubted its truthfulness, questioned its authority, or thought of coming up with an alternative. You see, Euclid (who lived over 2300 years ago!) wrote a textbook that was so popular that practically every educated person in the world used it to study geometry for the next 2000 plus years. It was truly a ground-shaking event, not only in the history of mathematics and but also in philosophy. The birth of non-Euclidean geometry was REALLY a big deal. It is called "Non-Euclidean" because it is different from Euclidean geometry, which was developed by an ancient Greek mathematician called Euclid. Image is used under a CC BY-SA 3.0 license. In a small triangle on the face of the earth, the sum of the angles is very nearly 180°. The surface of a sphere is not a Euclidean plane, but locally the laws of the Euclidean geometry are good approximations. \): On a sphere, the sum of the angles of a triangle is not equal to 180°.
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