GUATEMALA CITY - Torrential rains brought by the first tropical storm of the 2010 season pounded Central America and southern Mexico, triggering deadly landslides. The death toll stood at 15 Sunday but authorities said the number could rise.
Archimedes proved the formula for the area of a circle (A = Ï r 2, where r is the radius of the circle) and showed that the value of Ï lay between 3 + 1/7 (approximately 3.1429) and 3 + 10/71 (approximately 3.1408).
The number Ï (/ËpaÉª/) is a mathematical constant, the ratio of a circle's circumference to its diameter. It is approximately equal to 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.