    # Glossary  apex
in a pyramid, the vertex at which all lateral faces meet base
in a prism, the two congruent, parallel faces at the top and bottom; in a pyramid, the regular polygon that is not a lateral face congruent
having the same size and shape cube
a polyhedron with six congruent, square faces cylinder
a three-dimensional object with circular bases dodecahedron
a polyhedron with 12 congruent, pentagonal faces edge
the segment along which two faces meet Euler's Theorem
for any polyhedron, the sum of the number of vertices and faces is equal to two more than the number of edges; stated another way, F + V - E = 2 face
one of the surfaces of a polyhedron height
the distance from top to bottom of a three-dimensional figure icosahedron
a polyhedron with 20 congruent, triangular faces lateral face
in a prism, one of the rectangles that connects the bases to one another; in a pyramid, one of the triangles that connects the base to the apex length
the longest dimension of a solid figure; for a three-dimensional figure, it is usually the distance from front to back octahedron
a polyhedron with eight congruent, triangular faces polygon
a two-dimensional figure formed by connecting three or more straight line segments end to end (triangles, squares, and hexagons are examples of polygons) polyhedron
a three-dimensional figure whose faces are polygons prism
a three-dimensional figure with two parallel, congruent bases connected by rectangles rectangular prism
a prism whose bases are rectangles; in general, a prism can be described by the shape of its bases right prism
a prism in which the bases meet the lateral faces at right angles tetrahedron
a polyhedron with four congruent, triangular faces truncated icosahedron
a polyhedron with 32 faces, 12 of which are pentagons and 20 of which are hexagons vertex vertices[plural]
the point at which three or more faces meet width
distance from side to side     