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).
Rotation notation is usually denoted R(center, degrees).  1  Center  is the 'center of rotation.' This is the point around which you are performing your mathematical rotation.  2  Degrees  stands for how many degrees you should rotate. 3  A positive number usually by convention means counter clockwise.otation by 180Â° about the origin: R (origin, 180Â°). A rotation by 180Â° about the origin can be seen in the picture below in which A is rotated to its image A'. The general rule for a rotation by 180Â° about the origin is (A,B) (-A, -B).