The number Ï is a mathematical constant, the ratio of a circle 's circumference to its diameter, commonly approximated as 3.14159. It has been represented by the Greek letter  Ï  since the mid-18th century, though it is also sometimes spelled out as  pi  (/paÉª/). Being an irrational number, Ï cannot be expressed exactly as a fraction (equivalently, its decimal representation never ends and never settles into a permanent repeating pattern).
Paris, France is also known under the nicknames: The City of Lights The City of Love = The City od Love and Lights It is called these names because of the view from the eiffi â¦ el tower which is so romantic and you can see a view of everything that is lite at night while overlooking the eiffiel tower.
Why is Cairo Famous? Cairo is the capital of Egypt and the largest city in the  Middle-East and second-largest in Africa. It is a metropolitan  area, which is the 13th largest in the world. The â¦area is known for  its landmarks that represent both Ancient Egypt and its Islamic  history. King Cheops' pyramid was built in 2650 BC, which is one of  the Seven Wonders of the World. 2 people found this useful.