Definition of cross-section

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answer

In 2-dimensional geometry is the intersection with a line.
In 3-dimensional geometry is the intersection with a plane.

It is more often used in 3-dimensional geometry (for a sphere, cube, tetrahedral etc).

Can I say cross section as

Can I say cross section as the product of height and breadth ?

cross section

No - it can't be a product.
Put the full sentence with the cross section.

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