base (of a polyhedron)
Two congruent, parallel faces on a polyhedron
In geometry, the base of a polyhedron is the polygonal face that serves as the bottom or foundation of the solid figure. It is the face upon which the polyhedron would stand if it were placed on a flat surface. For example, a rectangular prism has two bases, each of which is a rectangle. The term base is often used in reference to pyramids and prisms, but it can be applied to any polyhedron that has at least one flat face. The base is an important geometric concept because it determines many properties of the polyhedron, such as its surface area, volume, and symmetry.
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