### Home > MC2 > Chapter 10 > Lesson 10.2.4 > Problem 10-117

10-117.

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

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

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

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