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okay here is the difrence a cuboid is a shape that is 3D and has eight faces a cylinder however is a 3D shape but it only has 2 faces the top and the bottom face
A solid
The simplest such shape is PYRAMID.
It is important to learn and remember the name of 3D shapes. A 19 faced 3d shape is called a nonadecahedron.
A prism has two parallel and congruent bases in the shape of polygons. Example - a cereal box (is rectangular prism). The top and bottom are rectangles(a polygon). They are the same size and shape (congruent) and also parallel. A cube (think of six sided dice) is a special rectangular prism. Imagine a a box where the top and bottom are triangles (of the shape size and shape). This is called a triangular prism.