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).
So delta ( r) is the change in position as measured in the direction of the force. Often r is used as name for a position vector. It is short for radius, but it does not necessarily mean that there are any circles involved. It simply means it describes an arrow from the origin of the coordinate system to a position. delta r, then, will be a displacement vector, which will not be thought of as starting at the origin. if it's high school physics.