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).
Area of a Circle and its formula. Formula for Area of circle. The formula to find a circle's area $$ \pi $$ (radius)2 usually expressed as $$ \pi \cdot r^2 $$ where r is the radius of a circle. The area of a circle is all the space inside a circle's circumference. In the picture, the area of the circle is the part of the circle that is changing color.