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).
Let R be the radius of the circle, Î¸ the central angle in radians, Î± is the central angle in degrees, c the chord length, s the arc length, h the sagitta of the segment, and d the height of the triangular portion. The radius is = + = +