# Difference between Pyramids and Prisms

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**Key difference:** In geometry, pyramids and prisms are two different shapes. The main difference between a pyramid and prism is the fact that a prism has two bases, while the pyramid only has one.

In geometry, pyramids and prisms are two different shapes. The main difference between a pyramid and prism is the fact that a prism has two bases, while the pyramid only has one.

A pyramid is a three-dimensional polyhedron. It has a base, which is a polygon. A polygon is any straight-sided shape, such as a triangle or a square. The base is connected to the sides or faces of the pyramid. The sides of the pyramid will always be triangular in shape. The sides of the pyramid meet the top. This is called the apex.

There are many types of pyramids, such as triangular pyramids, pentagonal pyramids, etc. The type of pyramid is determined by the base. For example: a triangular pyramid will have a triangular base, while a square pyramid will have a square base, and so on.

A prism is also a three-dimensional polyhedron, but it looks very different from a pyramid. A prism has two identical ends and all flat sides. The sides or faces are perpendicular to the base faces, i.e. they make a right angle with the base. In case the sides are not perpendicular to the base it is called an oblique prism.

The prism is different than the pyramid in that it does not have an apex. Instead, it can be said that it has two bases. The bases are joined together by the sides. A way to differentiate the prism is to check weather the cross section of the prism is the same all along its length.

Similar to a pyramid, there are many types of prisms. The type of prism is determined by the shape of the base. For example: a triangular prism will have triangular bases, while a rectangular prism will have rectangular bases, an octagonal prism will have octagon bases, and so on.

The term prism has another connotation in optics. In optics, a prism is a piece of glass, crystal, or plastic that bends light. This happens as light moves slower in the prism than in the air. The prism splits the light into a spectrum. The light spectrum has the same colors as a rainbow. This refraction of light is the same phenomenon that causes rainbows.

An easy way to distinguish between a pyramid and a prism is to associate an image with each word. For example: The pyramids of Ancient Egypt are based on the geometric pyramid. Whereas, a prism looks nothing like the pyramids of Ancient Egypt, it looks more like a tent or the shapes that game that toddles play in which one has to sort prisms and insert then into holes.

*Image Courtesy: chatt.hdsb.ca*

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