9 февраля 2013 г., 23:03
Pythagoras's theorem provides us with an equation that is true of all the right-angled triangles and that therefore also defines the right angle itself. In turn, the right angle defines the perpendicular and the perpendicular defines the dimensions - length, width, and height - of the space in which we live. Ultimately mathematics, via the right-angled triangle, defines the very structure of our three-dimensional world.
