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 radius of the circle is a line segment from the center of the circle to a point on the circle. The plural of radius is radii. In the above diagram, O is the center of the circle and and are radii of the circle.he radius of the circle is a line segment from the center of the circle to a point on the circle. The plural of radius is radii. In the above diagram, O is the center of the circle and and are radii of the circle.