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take a 3-dimensional object, and picture a sharp knife cutting it.

More correctly, a "plane" (thus, 2-dimensional) going through it.

The point at which the knife - or plane - intersects or touches the 3D object, is its cross section.

In a simple case, for example a sphere (meaning a "ball" with no middle, only a surface) then ANY cross section of it will be a "circle", (if you are "just touching it" you'd have a point, which is -- sort of like a circle of 0 radius).

That is the geometric definition.

A "practical" definition might be the "cross section of an airplane body". In THIS case your cross section would show the outer skin, the frame, the inner wall, the seats, floor, air ducts, wiring, hydraulic lines (which would look like 'o' because you presumably sliced it perpendicular to the way it is going), etc. Thus a computer aided design or drafting (CAD) program could show you a "slice" of something - a cross section - at any point, to for example see how close something is to something else, etc.

Another cross-section example would be CAT scans - such as for a brain problem - each computer generated slice is a "cross section" of the brain at that distance say from the top of your head (though it could be shown front to back, or probably any angle) - but what you are seeing is the intersection of a "plane" and the object.

Q: What is an example of a cross section?

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Cross-section of a trough, a wheelbarrow, some rooves.

A cylinder has a circular cross section that is parallel to its base.

trapezoidal cross section

Every cross-section of a sphere is a circle.

A Uniform Cross Section is the cross section of the solid, parallel to base, such that the resulting figure has the same shape and size as that of the base of the figure.More about Uniform Cross SectionSolids like pyramids and cones have slant heights and hence do not have uniform cross section.Examples of Uniform Cross SectionThe uniform cross section of the given prism is a square.The uniform cross section of the given cylinder is a circle.In short to say, uniform cross-section are when you dissect a 3D solid and you get all same shape (uniform).

Related questions

Yes a prism can have a square cross-section

Cross-section of a trough, a wheelbarrow, some rooves.

Yes. A cuboid, for example, has triangular cross sections

A cylinder has a circular cross section that is parallel to its base.

Not a right cross-section.

cross-section of a root

No, a cube cannot have an octagonal cross-section.

The cross section can be a triangle, rectangle or a hexagon.

trapezoidal cross section

Every cross-section of a sphere is a circle.

The cross-section of a cuboid is unified in the shape of a square or a rectangle.

A basketball is a sphere so a cross-section would be a circle.