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.
See alsoAxonometry, Cavalieri's Principle, Conic Section, Cylindric Section, Ellipsoidal Section, Inner Quermass, Lamina, Plane, Projection, Radon Transform, Spheric Section, Spheroidal Section, Spiric Section, Stereology Toric Section Explore this topic in the MathWorld classroom
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Weisstein, Eric W. "Cross Section." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CrossSection.html