A prism.
A rectangle is a special kind of prism. It is called a cuboid.
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Yes a prism is a 3D rectangle
There are 4 corners in a flat rectangle and 8 corners in a 3d rectangle(rectangular prism).Four.
A 2D rectangle has no edges but has 4 boundaries, and a 3D rectangle is a rectangular prism and has 12 edges.
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You just picture the rectangle in your mind and imagine all of the folds and sides.