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).
where (x 0, y 0) is the center of the circle and R its radius. The polar coordinates of a circle centered at the origin are particularly simple: r = R. A segment of a line joining two points on a circle is called a chord; a piece of a circle between two points is an arc.