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 R-value is a calculation which measures the flow of heat through an insulation product, or its resistance to heat. The U-value is a calculation which measures the amount of heat which escapes from insulation material. If insulation material has a high R-value and low U-value, it is a better insulator.