### Home > CC2 > Chapter 9 > Lesson 9.2.4 > Problem 9-87

9-87.

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

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).