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 circumference of a circle is the length around it. where r is the radius and d is the diameter of the circle, and Ã¯ (the Greek letter pi) is defined as the ratio of the circumference of the circle to its diameter. (the numerical value of pi is 3.141 592 654 589 793...).