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It depends on the angle of the plane of the cross section.

If it is parallel to the cube's face (or equivalently, two adjacent edges) the cross section will be a square congruent to the face. If the plane is parallel to just one edge (and so angled to a face), the cross section will be a rectangle which will have a constant width. Its length will increase, remain at a maximum level and then decrease. If neither, it will be a hexagon-triangle-hexagon-triangle-hexagon (triangles when passing through a vertex).

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Q: What is a cross section of a cube?

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Yes, but not a regular one.

Along any edge

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

length = volume/cross-section

The vertical cross section of a right vertical cone is a triangle if that cross section is taken from the vertex. Any other vertical cross section will reveal a hyperbola (with endpoints on the base of the cone). A link can be found below.

Related questions

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

Cross section of a Cube90 Degree Vertical & Horizontal cross sections of a Cube are square. Brahmajyothi

It is a square.

A square

A square.

Infinitely many.

Yes it can.

Rectangle

Yes, but not a regular one.

It will be the same shape as a square

Cube, Cuboid. Any prism with a quadrilateral cross section

Along any edge

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