## The Pyramid

A **pyramid** is a polyhedron with a polygon base of any shape, and all other faces are triangles which have common vertex.

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A **pyramid** is a polyhedron with a polygon base of any shape, and all other faces are triangles which have common vertex.

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Like pyramids, cones are generally classified according to their bases.

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The Cylinder

Cylinder is a solid bounded by a closed cylindrical surface and two parallel planes.

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Prism is a polyhedron in which two faces are equal polygons in parallel planes, and all other faces are parallelograms. There are two types of prism; oblique prism and right prism. Oblique prism is when the axis is *not* perpendicular to the base and right prism if the axis is parallel to the base. In right prism, all lateral areas are rectangle.

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