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 formula is A=pi*r2, where pi = approximately 3.1416 and r is the radius of the circle (length of a straight line drawn from the center to the outside edge of the circle. The area is pi times the radius squared. For example, A circle 6 feet wide (6 ft. diameter) has a radius of 3 feet (diameter = 2r).