In ancient Egypt, the Nile river, while sustaining the life and economic development of the region by fertilizing the soil surrounding it, was also a source of great troubles because of its yearly flooding. As a result, the markings delimiting farming lands for their owners would disappear, hand had to be redone promptly so the farmers could get back to work. To resurvey the land, the harpedonaptai (literally *'rope stretcher'*) came up with an effective way of measuring the land by stretching a rope divided into equally long twelve segments into a triangle of side lengths $3,4,\text{ and } 5$ (which we call a Pythagorean Triple today), thus ensuring the formation of a right angle and allowing to quickly plot farmers' properties anew. The same result could not be achieved, had they tried, by stretching a rope into a rectangle with four sides, as ensuring right angles is not possible that way. It is even possible to create rectangles with no area at all. It's interesting to note the Greek word "geōmetria" literally means "land measurement". From that activity, it has evolved into a branch of mathematics concerned with the properties of space such as the distance, shape, size and relative position of figures.