The cross section of a cuboid box, bt a plane at an angle to all of its sides will be a point, triangle or quadrilateral - depending on it location.
The cross section by a plane perpendicular to an axis of the box will be a rectangle.
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The answer will depend on the shape (and size) of the box: some have a rectangular cross-section, others circular.
A prism is a 3 dimensional shape such as a cube or a box and has a unified cross-section.
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.