A pentagonal prism has 15 edges and 10 vertices. It also has seven faces: two pentagons, which form its bases, and five rectangles for the sides.
Any type of prism is three-dimensional. They also have a number of features in common. A prism has two bases that are parallel and congruent polygons. Prisms have flat sides, which are commonly called "faces." The number of faces equals the number of sides of the base plus two. The area where two faces meet is called an "edge." However, rounded figures, such as cones, spheres and cylinders, do not have edges. A "vertex" is a corner where two different edges meet.