A cross section of a solid is a plane figure obtained by the intersection of that solid with a plane. The cross section of an object therefore represents an infinitesimal "slice" of a solid, and may be different depending on the orientation of the slicing plane. While the cross section of a sphere is always a disk, the cross section of a cube may be a square, hexagon, or other shape.

CITE THIS AS:

Weisstein, Eric W. "Cross Section." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/CrossSection.html