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Its algebra.
It is a polyhedron.
A rectanglar or even rectangular, is an adjective and there is no such thing. You can have a rectangular pyramid or a rectangular prism. The formula will depend on which of these it is and on what information is available to you.
Yes.
cube cubeoid prism
a rectangle...
yes, they are different.
width times length times height
It is a cuboid
3 more
A triangular prism has a triangle and a rectangular prism doesn't.
Up to ten.