## 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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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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The Triangle

**Definition of a Triangle**

Triangle is a closed figure bounded by three straight lines called sides. It can also be defined as polygon of three sides.

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