### Home > CC2MN > Chapter 10 > Lesson 10.3.4 > Problem 10-99

10-99.

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).