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).
Amanda, The area of a circle is given by the formula A = Ï r 2, where A is the area and r is the radius. The circumference of a circle is C = 2 Ï r. If we solve for r in the second equation, we have r = C / (2 Ï).Now we use this to replace r in the first equation: A = Ï [ C / (2 Ï) ] 2.manda, The area of a circle is given by the formula A = Ï r 2, where A is the area and r is the radius. The circumference of a circle is C = 2 Ï r. If we solve for r in the second equation, we have r = C / (2 Ï).