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.
The parallel postulate. The fifth postulate in Euclid's Elements can be rephrased as. The postulate is not true in 3D, but in 2D it seems to be a valid statement. Considering the importance of postulates however, a seemingly valid statement is not good enough. Exactly one line through the red point is parallel to the thick white line.