Volume 2 : 3 ratio of the volumes of the sphere and cylinder is credited to Archimedes. The volume of a sphere is the integral of an infinite number of infinitesimally small circular disks of thickness "dx". The calculation for the volume of a sphere with center 0 and radius "r" is as follows. The surface area of the circular disk is formula_10. The radius of the circular disks, defined such that the x-axis cuts perpendicularly through them, is or where y or z can be taken to represent the radius of a disk at a particular x value. Using y
4-D (The X-Files) 4-D (The X-Files) "4-D" is the fourth episode of the ninth season and the 186th episode overall of the American science fiction television series "The X-Files". The episode first aired in the United States on December 9, 2001 on the Fox network. It was written by Steven Maeda and directed by Tony Wharmby. The episode is a "monster-of-the-week" episode, a stand-alone plot which is unconnected to the mythology, or overarching fictional history, of "The X-Files". The episode earned a Nielsen rating of 5.1 and was viewed by 5.38 million households. It received mixed to positive reviews from television critics. The