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).
Area of a Circle. The area of a circle = Ïr2. where r is the radius of the circle and Ï is the ratio of a circle's circumference to its diameter. Ï (pronounced pie and often written Pi) is an infinite decimal with a common approximation of 3.14159.