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  1. Is each shape below a prism? If so, identify the shape that is the base. If not, explain why not. Homework Help ✎

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A prism is a three-dimensional polyhedron composed of polygons which has two congruent and parallel sides, or bases.

Examine the shape. Does it fit the characteristics of a prism stated above?

It is a prism because it has a pair of triangular bases.

See part (a).

It is not a prism because not all of its surfaces are polygons.

See part (a).