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).
Definition of R-squared In statistics, R-squared (R 2), or the coefficient of determination, is a widely used measure of a model (regression) performance against known observations. It is used in the asset management industry to measure the relationship between a portfolio and its benchmark. In the asset management world it is expressed as a percentage.