Generally speaking, they are approximately cuboid. Having said that, my sharpener has a slightly narrower (pinched) middle. And lots of erasers and sharpeners for younger children come in all sorts of weird and wonderful shapes.
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a box is good for cuboid
The base of a cuboid is a rectangle.
A cross-section of a cuboid is the two-dimensional shape that results from cutting the cuboid with a plane. It is formed by the intersection of the plane with the three-dimensional cuboid. The cross-section of a cuboid can be a rectangle, square, or even a triangle, depending on how the cuboid is cut. The shape and size of the cross-section will vary based on the orientation and angle of the cutting plane relative to the cuboid.
A cube or a cuboid could have 12 edges, 8 vertices, and 6 faces.