Located in Columbia, Canada; the Williston Lake is one of the largest manmade lakes available. The lake build on the Peace River and covers an area of about 251 km long and 155 km wide totaling up to 1,761 square km.
An axiom or postulate is a premise or starting point of reasoning. As classically conceived, an axiom is a premise so evident as to be accepted as true without controversy.
All theorems in Euclidean geometry that use the fifth postulate, will be altered when you rephrase the parallel postulate. As an example; in Euclidean geometry the sum of the interior angles of a triangle is 180Â°, in non-Euclidean geometry this is not the case.