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 formula for circumference of a circle is 2Ïr, where ârâ is the radius of the circle and the value of Ï is approximately 22/7 or 3.14. The circumference of a circle is also called the... The formula for circumference of a circle is 2Ïr, where ârâ is the radius of the circle and the value of Ï is approximately 22/7 or 3.14.