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Yes, prisms are always 3D. It is described by taking a shape and stretching it linearly (in a straight line) so that the shape at the base is perpendicular to the sides. Also, if the stretch was "up", the top would be the exact same shape as the base. For instance, a circle stretched is a cylinder, a rectangle stretched is a box ("box" is lay term for "rectangular prism" as in "Could you pass me that rectangular prism of cereal?"). You can also stretch a line, but a line is not a shape, so the result would not be a prism. Btw, stretching a line would give you a plane; vert 2D.

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Q: Are prism always three dimensional
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