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).
Circle with a center of (2, -1) and a radius of 4. Definition : A circle is the set of all points that are the same distance, r, from a fixed point. General Formula: X 2 + Y 2=r2 where r is the radius. Unlike parabolas, circles ALWAYS have X 2 and Y 2 terms. X2 + Y2=4 is a circle with a radius of 2 (since 4 =22)