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 value of pi is 3.142 or 22/7. 2 pi r means 2 multiply by pi multiply by r which is the radius. this the area of a circle. r depends on the circle's radius(the dictance from the centre of the circle to any part of the circumference)